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Note 13 - Income Taxes - Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Thousands | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Deferred tax assets: |  |
Allowance for loan and lease losses | $ 1,288 | $ 1,327
Supplemental retirement plan | 469 | 454
Investment security basis adjustment | 18 | 18
Nonaccrual interest income | 297 | 389
Accrued compensation | 244 | 222
Deferred origination fees, net | 30 |
Net unrealized loss on AFS securities |  | 41
Lease liability | 1,051 |
Gross deferred tax assets | 3,397 | 2,451
Deferred tax liabilities: |  |
Premises and equipment | 583 | 328
Net unrealized gain on AFS securities | 490 |
Net unrealized gain on equity securities | 62 | 1
FHLB stock dividends | 139 | 139
Intangibles | 378 | 342
Mortgage servicing rights | 82 | 75
Deferred origination fees, net |  | 13
Acquisition fair value adjustments | 253 | 275
Right of use assets | 1,032 |
Other | 4 | 5
Gross deferred tax liabilities | 3,023 | 1,178
Net deferred tax assets | $ 374 | $ 1,273

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