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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		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Net income	$ 10,451	$ 9,066	$ 20,082	$ 17,934
Weighted average common shares outstanding, basic (in shares)	15,712,204	16,689,398	15,775,462	16,821,842
Total dilutive effect of potential common shares (in shares)	63,116	99,217	72,036	91,030
Weighted average common shares outstanding, diluted (in shares)	15,775,320	16,788,615	15,847,498	16,912,872
Basic earnings per common share (in dollars per share)	$ 0.67	$ 0.54	$ 1.27	$ 1.06
Diluted earnings per common share (in dollars per share)	$ 0.66	$ 0.54	$ 1.27	$ 1.06
Antidilutive potential common shares (in shares)		1,793		867
Share-based Payment Arrangement, Option [Member]
Dilutive effect of potential common shares (in shares)	56,818	69,914	57,795	62,384
Restricted Stock [Member]
Dilutive effect of potential common shares (in shares)	6,298	29,303	14,241	28,646
Antidilutive potential common shares (in shares)		1,793		867

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