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Note 8 - Income Taxes - Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Thousands | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Deferred tax assets: |  |
Bad debts | $ 2,182 | $ 1,859
Deferred loan fees |  | 49
Deferred compensation | 337 | 322
Unrealized depreciation on securities available-for-sale, net |  | 743
Net operating loss | 3,218 | 1,373
Tax credits | 183 | 147
Nonaccrual loan interest income | 162 | 62
Share based compensation | 202 | 185
REO writedowns | 55 | 195
Unqualified deferred compensation plan | 58 | 54
Other-than-temporary impairment | 40 | 52
Accrued vacation | 35 | 56
Impairment on land | 49 | 48
Other | 93 | 78
Total deferred tax assets | 6,614 | 5,223
Deferred tax liabilities: |  |
Depreciation | (1,067) | (550)
Prepaids | (368) | (254)
Mortgage servicing rights | (49) | (68)
Deferred stock dividends | (101) | (76)
Deferred loan costs, net of fees | (93) |
Unrealized appreciation on securities available-for-sale, net | (1,126) |
Purchase accounting | (187) | (118)
Partnership | (173) |
Other | (92) | (191)
Total deferred tax liabilities | (3,256) | (1,257)
Valuation allowance | (92) | (87)
Net deferred tax asset | $ 3,266 | $ 3,879

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