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Note 10 - Shares Outstanding and Earnings Per Share - Earnings Per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Weighted average basic shares outstanding (in shares)	11,418	11,369
Assumed exercise of stock options and issuance of stock awards (in shares)
Weighted average diluted shares outstanding (in shares)	11,418	11,369
Net income	$ 7,629	$ 7,699
Basic earnings per share (in dollars per share)	$ 0.67	$ 0.68
Diluted earnings per share (in dollars per share)	$ 0.67	$ 0.68
Anti-dilutive securities outstanding (in shares)	65	42

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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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