Annual report pursuant to Section 13 and 15(d)

Income Taxes (Deferred Tax Assets and Liabilities) (Details)

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Income Taxes (Deferred Tax Assets and Liabilities) (Details) - USD ($)
Dec. 31, 2017
Dec. 31, 2016
Deferred income tax assets:    
Sale leaseback deferred gain $ 1,382,270 $ 2,387,309
Inventory valuation reserves 209,745 379,005
Allowance for doubtful accounts 7,944 28,556
Inventory capitalization 943,203 1,780,957
Environmental reserves 124,029 199,191
Interest rate swap 0 15,185
Warranty accrual 8,132 62,035
Deferred compensation 36,617 60,745
Accrued bonus 483,238 337,028
Accrued expenses 24,749 77,629
State net operating loss carryforwards 2,069,258 1,724,843
Other 479,338 389,530
Total deferred income tax assets 5,768,523 7,442,013
Valuation allowance (2,087,860) (1,790,051)
Total net deferred income taxes 3,680,663 5,651,962
Valuation allowance    
Tax over book depreciation and amortization 3,971,816 6,946,812
Prepaid expenses 174,322 211,300
Interest rate swap 87,016 0
Other 83,419 103,342
Total deferred income tax liabilities 4,316,573 7,261,454
Defered income taxes $ (635,910) $ (1,609,492)