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Note 8 - Income Taxes - Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Deferred tax assets: |  |
Bad debts | $ 3,090 | $ 2,182
Deferred compensation | 343 | 337
Net operating loss | 2,553 | 3,218
Tax credits | 70 | 183
Nonaccrual loan interest income | 206 | 162
Share based compensation | 256 | 202
REO writedowns | 23 | 55
Unqualified deferred compensation plan | 60 | 58
Other-than-temporary impairment | 39 | 40
Accrued vacation | 75 | 35
Impairment on land | 0 | 49
Other | 84 | 93
Total deferred tax assets | 6,799 | 6,614
Deferred tax liabilities: |  |
Depreciation | (1,147) | (1,067)
Prepaids | (443) | (368)
Mortgage servicing rights | (163) | (49)
Deferred stock dividends | (100) | (101)
Deferred loan costs, net of fees | (288) | (93)
Unrealized appreciation on securities available-for-sale, net | (2,767) | (1,126)
Purchase accounting | (492) | (187)
Partnership | (280) | (173)
Other | (116) | (92)
Total deferred tax liabilities | (5,796) | (3,256)
Valuation allowance | (22) | (92)
Net deferred tax asset | $ 981 | $ 3,266

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