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Note 12 - Earnings Per Share - Basic and Diluted Earnings Per Common Share (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Net income	$ 9,156	$ 9,100	$ 29,238	$ 27,034
Weighted average common shares outstanding, basic (in shares)	15,603,992	16,512,823	15,717,678	16,717,704
Total dilutive effect of potential common shares (in shares)	60,595	99,593	67,806	92,721
Weighted average common shares outstanding, diluted (in shares)	15,664,587	16,612,416	15,785,484	16,810,425
Basic earnings per common share (in dollars per share)	$ 0.59	$ 0.55	$ 1.86	$ 1.62
Diluted earnings per common share (in dollars per share)	$ 0.58	$ 0.55	$ 1.85	$ 1.61
Antidilutive potential common shares (in shares)		4,263		2,011
Share-based Payment Arrangement, Option [Member]
Dilutive effect of potential common shares (in shares)	52,360	65,910	55,898	63,898
Restricted Stock [Member]
Dilutive effect of potential common shares (in shares)	8,235	33,683	11,908	28,823
Antidilutive potential common shares (in shares)		4,263		2,011

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