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Note 13 - Earnings Per Share - Calculation for Basic and Diluted Earnings Per Common Share (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Net income	$ 6,202	$ 6,084
Dividends on preferred stock
Net income available to common shareholders	$ 6,202	$ 6,084
Weighted average common shares outstanding, basic (in shares)	16,998,125	17,859,197
Total dilutive effect of potential common shares (in shares)	74,049	33,334
Weighted average common shares outstanding, diluted (in shares)	17,072,174	17,892,531
Basic (in dollars per share)	$ 0.36	$ 0.34
Diluted (in dollars per share)	$ 0.36	$ 0.34
Stock options (in shares)	53,022	148,344
Total potential antidilutive shares (in shares)	53,022	148,344
Employee Stock Option [Member]
Stock attributable to share based compensation (in shares)	53,067	27,159
Stock options (in shares)	49,743	119,727
Total potential antidilutive shares (in shares)	49,743	119,727
Restricted Stock [Member]
Stock attributable to share based compensation (in shares)	20,982	6,175
Stock options (in shares)	3,279	28,617
Total potential antidilutive shares (in shares)	3,279	28,617

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- Definition

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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