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Note 25 - Selected Quarterly Financial Information (Unaudited) - Selected Quarterly Financial Information (Unaudited) (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 12 Months Ended 15 Months Ended
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2016
Sep. 30, 2016
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2015
Sep. 30, 2015
Jun. 30, 2015
Mar. 31, 2015
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Jun. 30, 2017
Interest income $ 6,773 $ 6,728 $ 6,578 $ 6,343 $ 6,244 $ 6,215 $ 6,289 $ 6,346 $ 5,109 $ 4,553 $ 4,555 $ 4,496 $ 26,422 $ 25,094 $ 18,713  
Interest expense 344 343 346 359 393 414 456 500 302 220 239 243 1,392 1,763 1,004  
Net interest income 6,429 6,385 6,232 5,984 5,851 5,801 5,833 5,846 4,807 4,333 4,316 4,253 25,030 23,331 17,709  
Provision for loan losses 298 150 256 211 220 200 150 75 50 915 645 50  
Net interest income after provision for loan losses 6,131 6,235 5,976 5,773 5,631 5,601 5,683 5,771 4,807 4,333 4,266 4,253 24,115 22,686 17,659  
Noninterest income 1,641 1,748 1,856 1,453 1,436 1,750 1,615 1,368 1,320 1,226 1,214 1,364 6,698 6,169 5,124  
Noninterest expenses 5,254 5,046 4,803 5,155 4,697 4,924 4,844 4,990 4,517 3,651 3,761 3,679 20,258 19,455 15,608  
Income before income taxes 2,518 2,937 3,029 2,071 2,370 2,427 2,454 2,149 1,610 1,908 1,719 1,938 10,555 9,400 7,175  
Income tax expense 928 825 835 515 626 666 667 564 501 507 487 469 3,103 2,523 1,964  
Net Income 1,590 2,112 2,194 1,556 1,744 1,761   1,585 1,109 1,401 1,232 1,469 7,452 6,877 5,211 $ 1,787
Less net income attributable to the noncontrolling interest in subsidiary 3 3 4 3 3 3 4 3 3 3 4 3 13 13 13  
Net income $ 1,587 $ 2,109 $ 2,190 $ 1,553 $ 1,741 $ 1,758 $ 1,783 $ 1,582 $ 1,106 $ 1,398 $ 1,228 $ 1,466 $ 7,439 $ 6,864 $ 5,198  
Basic (in dollars per share) $ 0.49 $ 0.63 $ 0.66 $ 0.46 $ 0.52 $ 0.53 $ 0.53 $ 0.47 $ 0.38 $ 0.51 $ 0.45 $ 0.53 $ 2.24 $ 2.05 $ 1.87  
Diluted (in dollars per share) $ 0.48 $ 0.63 $ 0.66 $ 0.46 $ 0.52 $ 0.53 $ 0.53 $ 0.47 $ 0.38 $ 0.51 $ 0.45 $ 0.53 $ 2.23 $ 2.05 $ 1.87