Annual report pursuant to Section 13 and 15(d)

Stock Options, Stock Grants and New Stock (Stock Award Activity) (Details)

v3.6.0.2
Stock Options, Stock Grants and New Stock (Stock Award Activity) (Details) - Stock Awards [Member] - $ / shares
12 Months Ended
May 05, 2016
Feb. 19, 2016
Nov. 21, 2014
Oct. 16, 2014
Dec. 31, 2016
Dec. 31, 2015
Jan. 03, 2015
2005 Stock Awards Plan [Member]              
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]              
Outstanding, beginning of the year (shares)         51,440 66,403 19,252
Vested (shares)         (21,133) (17,903) (7,434)
Forfeited or expired (shares)         (1,260) (60) (160)
Outstanding, end of the year (shares)         121,457 51,440 66,403
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Roll Forward]              
Outstanding, beginning of the year, weighted average grant date fair value (dollars per share)         $ 15.57 $ 15.00 $ 11.15
Vested, weighted average grant date fair value (dollars per share)         13.12 13.86 10.60
Forfeited or expired, weighted average grant date fair value (dollars per share)         17.73 13.34 13.34
Outstanding, end of the year, weighted average grant date fair value (dollars per share)         $ 10.03 $ 15.57 $ 15.00
2015 Stock Awards Plan [Member]              
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]              
Granted (shares) 42,348 50,062          
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Roll Forward]              
Granted, weighted average grant date fair value (dollars per share) $ 8.05 $ 7.51          
October 16, 2014 [Member] | 2005 Stock Awards Plan [Member]              
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]              
Granted (shares)             31,080
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Roll Forward]              
Granted, weighted average grant date fair value (dollars per share)             $ 15.69
November 21, 2014 [Member] | 2005 Stock Awards Plan [Member]              
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]              
Granted (shares)             23,665
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Roll Forward]              
Granted, weighted average grant date fair value (dollars per share)             $ 15.85
January 5, 2015 [Member] | 2005 Stock Awards Plan [Member]              
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]              
Granted (shares)           3,000  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Roll Forward]              
Granted, weighted average grant date fair value (dollars per share)           $ 17.95  
February 19, 2016 [Member] | 2015 Stock Awards Plan [Member]              
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]              
Granted (shares)         50,062    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Roll Forward]              
Granted, weighted average grant date fair value (dollars per share)         $ 7.51    
May 5, 2016 [Member] | 2015 Stock Awards Plan [Member]              
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]              
Granted (shares)         42,348    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Roll Forward]              
Granted, weighted average grant date fair value (dollars per share)         $ 8.05    
Chief Executive Officer [Member] | 2005 Stock Awards Plan [Member]              
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]              
Granted (shares)       31,080      
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Roll Forward]              
Granted, weighted average grant date fair value (dollars per share)       $ 15.69      
Specialty Pipe And Tube, Inc. [Member] | Certain Management Employees [Member] | 2005 Stock Awards Plan [Member]              
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]              
Granted (shares)     23,665        
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Roll Forward]              
Granted, weighted average grant date fair value (dollars per share)     $ 15.85