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Note 13 - Income Taxes - Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | ---
Deferred tax assets: |  |
Allowance for loan and lease losses | $ 1,210 | $ 2,243
Supplemental retirement plan | 528 | 382
Investment security basis adjustment | 18 | 66
Nonaccrual interest income | 371 | 456
OREO adjustments | 2 | 26
Accrued compensation | 201 | 261
Other | 86 | 82
Gross deferred tax assets | 2,416 | 3,516
Deferred tax liabilities: |  |
Premises and equipment | 356 | 445
Net unrealized gain on securities | 347 | 618
FHLB stock dividends | 139 | 225
Intangibles | 307 | 449
Mortgage servicing rights | 71 | 103
Deferred origination fees, net | 294 | 63
Acquisition fair value adjustments | 250 | 1
Other | 5 | 5
Gross deferred tax liabilities | 1,769 | 1,909
Net deferred tax assets | $ 647 | $ 1,607

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