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Note 6 - Income Taxes - Deferred Tax Assets (Liabilities) (Details) - USD ($) $ in Thousands | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Allowance for uncollectable accounts | $ 79 | $ 53
Inventories reserve | 348 | 267
Accrued vacation | 112 | 145
Accrued bonus | 171 |
Stock-based compensation and equity appreciation rights | 62 | 54
Lease Accounting ASC 842 Lease Liability | 1,230 |
Section 481(a) adjustment | 716 | (249)
Net operating loss carryforwards | 97 | 175
Tax credit carryforwards | 171 | 449
Other | 7 | 76
Total | 2,993 | 970
Valuation allowance | (1,403) | (614)
Deferred tax (liabilities) assets | 1,590 | 356
Prepaid expenses |  | (40)
Lease Accounting ASC 842 Lease Asset | (1,158) |
Property and equipment | (432) | (316)
Deferred tax liabilities | (1,590) | (356)
Net deferred tax assets |  |

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