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Income Taxes - Deferred Tax Assets and Liabilities (Details) - USD ($) | Dec. 31, 2018 | Dec. 31, 2017
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Deferred income tax assets: |  |
Sale leaseback deferred gain | $ 1,310,850 | $ 1,382,270
Inventory valuation reserves | 174,377 | 209,745
Allowance for doubtful accounts | 35,955 | 7,944
Inventory capitalization | 1,500,710 | 943,203
Environmental reserves | 0 | 124,029
Warranty accrual | 8,084 | 8,132
Deferred compensation | 28,090 | 36,617
Accrued bonus | 910,824 | 483,238
Accrued expenses | 22,957 | 24,749
State net operating loss carryforwards | 1,934,071 | 2,069,258
Equity security mark to market | 622,189 | 3,248
Straight line lease | 230,841 | 123,570
Other | 507,997 | 352,520
Total deferred income tax assets | 7,286,945 | 5,768,523
Valuation allowance | (1,765,993) | (2,087,860)
Total net deferred income tax assets | 5,520,952 | 3,680,663
Deferred income tax liabilities: |  |
Tax over book depreciation and amortization | 5,120,533 | 3,971,816
Prepaid expenses | 377,498 | 174,322
Interest rate swap | 103,708 | 87,016
Other | 172,201 | 83,419
Total deferred income tax liabilities | 5,773,940 | 4,316,573
Deferred income taxes | $ (252,988) | $ (635,910)

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