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Note 7 - Segment Information - Segment Reporting (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Dec. 31, 2017
Net interest income $ 10,763 $ 10,268 $ 32,913 $ 31,204  
Provision expense 962 1,601 1,695 1,921  
Noninterest income 1,927 2,282 7,541 7,507  
Noninterest expense 9,761 9,222 29,243 28,473  
Tax expense 221 74 1,428 1,706  
Net income 1,746 1,653 8,088 6,611  
Assets 1,033,516 1,019,614 1,033,516 1,019,614 $ 1,026,290
Banking [Member]          
Net interest income 10,168 9,681 30,289 28,558  
Provision expense 950 1,615 1,550 1,815  
Noninterest income 1,875 2,224 6,916 6,965  
Noninterest expense 9,107 8,579 27,236 26,477  
Tax expense 226 69 1,199 1,338  
Net income 1,760 1,642 7,220 5,893  
Assets 1,021,730 1,008,078 1,021,730 1,008,078  
Consumer Finance [Member]          
Net interest income 595 587 2,624 2,646  
Provision expense 12 (14) 145 106  
Noninterest income 52 58 625 542  
Noninterest expense 654 643 2,007 1,996  
Tax expense (5) 5 229 368  
Net income (14) 11 868 718  
Assets $ 11,786 $ 11,536 $ 11,786 $ 11,536