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Note 2 - Earnings Per Common Share - Basic and Diluted Earnings Per Common Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended			9 Months Ended
	Sep. 30, 2017	Dec. 31, 2016	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Net income	$ 7,855	$ 8,303	$ 8,437	$ 25,210	$ 25,161
Basic earnings per common share - weighted-average shares (in shares)	54,517		54,218	54,479	54,126
Effect of dilutive stock options (in shares)	373		308	324	296
Diluted earnings per common share - weighted-average shares and assumed conversions (in shares)	54,890		54,526	54,803	54,422
Basic earnings per common share (in dollars per share)	$ 0.14		$ 0.16	$ 0.46	$ 0.46
Diluted earnings per common share (in dollars per share)	$ 0.14		$ 0.15	$ 0.46	$ 0.46

X

- Definition

The amount of net income (loss) for the period per each share of common stock or unit outstanding during the reporting period.

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The amount of net income (loss) for the period available to each share of common stock or common unit outstanding during the reporting period and to each share or unit that would have been outstanding assuming the issuance of common shares or units for all dilutive potential common shares or units outstanding during the reporting period.

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Additional shares included in the calculation of diluted EPS as a result of the potentially dilutive effect of share based payment arrangements using the treasury stock method.

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