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Income Taxes (Details 2) - USD ($) $ in Thousands | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Deferred tax assets: |  |
Net operating loss carryforwards | $ 21 | $ 26
Allowance for doubtful accounts | 81 | 53
Amortization - intangibles | 4 | 0
Charitable contributions | 43 | 0
Accrued liabilities | 7 | 0
Accrued vacation | 76 | 78
Deferred buy-back asset | 1,776 | 1,645
Deferred income | 304 | 198
Right-of-use asset | 91 | 0
Other | 83 | 76
Gross deferred tax assets | 2,486 | 2,076
Deferred tax liabilities: |  |
Retainage | (518) | (425)
Deferred buy-back obligation | (1,421) | (1,324)
Fixed assets | (2,236) | (1,667)
Prepaids | (104) | (78)
Unrealized gain loss | (2) | (9)
Lease liability | (91) | 0
Gross deferred tax liabilities | (4,372) | (3,503)
Valuation allowance | 0 | 0
Net deferred tax liability | $ (1,886) | $ (1,427)

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