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Note 11 - 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, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Net income	$ 9,100	$ 7,652	$ 27,034	$ 20,272
Weighted average common shares outstanding, basic (in shares)	16,512,823	17,005,654	16,717,704	17,005,350
Total dilutive effect of potential common shares (in shares)	99,593	77,075	92,721	71,608
Weighted average common shares outstanding, diluted (in shares)	16,612,416	17,082,729	16,810,425	17,076,958
Basic earnings per common share (in dollars per share)	$ 0.55	$ 0.45	$ 1.62	$ 1.19
Diluted earnings per common share (in dollars per share)	$ 0.55	$ 0.45	$ 1.61	$ 1.19
Antidilutive potential common shares (in shares)	4,263	71,592	2,011	75,868
Employee Stock Option [Member]
Dilutive effect of potential common shares (in shares)	65,910	49,739	63,898	50,140
Antidilutive potential common shares (in shares)		71,592		71,592
Restricted Stock [Member]
Dilutive effect of potential common shares (in shares)	33,683	27,336	28,823	21,468
Antidilutive potential common shares (in shares)	4,263		2,011	4,276

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Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) or earnings per unit (EPU) in the future that were not included in the computation of diluted EPS or EPU because to do so would increase EPS or EPU amounts or decrease loss per share or unit amounts for the period presented.

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