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Income Taxes - Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Thousands | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Deferred income tax assets: |  |
Sale leaseback deferred gain | $ 0 | $ 1,311
Inventory valuation reserves | 199 | 174
Inventory capitalization | 1,696 | 1,501
Accrued bonus | 497 | 911
State net operating loss carryforwards | 1,835 | 1,934
Federal net operating loss carryforwards | 139 | 0
Equity security mark to market | 217 | 622
Straight line lease | 0 | 231
Lease liabilities | 8,945 | 150
Interest limitation carryforwards | 754 | 0
Other | 445 | 453
Total deferred income tax assets | 14,727 | 7,287
Valuation allowance | (1,700) | (1,766)
Total net deferred income tax assets | 13,027 | 5,521
Deferred income tax liabilities: |  |
Tax over book depreciation and amortization | 4,859 | 5,121
Prepaid expenses | 296 | 377
Lease assets | 8,537 | 92
Interest rate swap | 77 | 104
Other | 48 | 80
Total deferred income tax liabilities | 13,817 | 5,774
Deferred income taxes | $ (790) | $ (253)

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