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Note 6 - Accumulated Other Comprehensive Income (Loss) - Changes in Accumulated Other Comprehensive Income (Loss) by Component, Net of Tax (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Balance $ 134,260 $ 122,716 $ 128,290 $ 119,863
Change in accounting principle, ASC 2016-01      
Change in accounting principle, ASC 2018-02      
Total other comprehensive income (loss) 780 (1,025) 2,311 (2,593)
Balance 135,913 124,233 135,913 124,233
AOCI, Accumulated Gain (Loss), Debt Securities, Available-for-sale, Parent [Member]        
Balance [1] 1,377 (431) (154) 1,091
Other comprehensive income (loss) before reclassification [1] 783 (1,025) 2,464 (2,593)
Amount reclassified from accumulated other comprehensive income [1] (3)   (153)  
Change in accounting principle, ASC 2016-01 [1],[2]       (141)
Change in accounting principle, ASC 2018-02 [1],[2]       187
Total other comprehensive income (loss) [1]       (2,547)
Balance [1] $ 2,157 $ (1,456) $ 2,157 $ (1,456)
[1] All amounts are net of tax. Amounts in parentheses indicate debits to AOCI.
[2] Reclassifications are the result of the adoption of ASUs 2016-01 and 2018-02 effective for the Company beginning January 1, 2018. The reclassifications are presented within the Consolidated Statement of Changes in Stockholders' Equity for the affected transitional periods.