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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)

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