Annual report pursuant to Section 13 and 15(d)

Income Taxes (Narrative) (Details)

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Income Taxes (Narrative) (Details) - USD ($)
 12 Months Ended
Dec. 31, 2015
Jan. 03, 2015
Dec. 28, 2013
Income Tax Disclosures [Line Items]      
Income tax payments $ 2,251,000 $ 2,091,000 $ 2,445,000
Deferred Tax Assets, Valuation Allowance 1,694,000 1,570,000  
State Jurisdiction [Member]      
Income Tax Disclosures [Line Items]      
Net operating loss carryforwards 47,042,000 50,774,000  
Portion of NOL subject to valuation allowance 47,042,000    
Valuation allowance for net operating loss carrryforwards 1,616,000 1,570,000  
Valuation allowance, other deferred tax assets [Member]      
Income Tax Disclosures [Line Items]      
Deferred Tax Assets, Valuation Allowance 78,000    
Bristol Fab and Ram-fab [Member]      
Income Tax Disclosures [Line Items]      
Benefit from income taxes 651,000 $ 3,807,000 $ 812,000
Continuing Operations [Member] | Operating Loss Carryforwards [Member] | State Jurisdiction [Member]      
Income Tax Disclosures [Line Items]      
Increase in valuation allowance during the period 94,000    
Discontinued Operations [Member] | Operating Loss Carryforwards [Member] | State Jurisdiction [Member]      
Income Tax Disclosures [Line Items]      
Increase in valuation allowance during the period $ 30,000