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Note 3 - 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
	Mar. 31, 2019	Mar. 31, 2018	Dec. 31, 2018
Net income	$ 13,546	$ 10,331	$ 44,696
Basic earnings per common share - weighted-average shares (in shares)	54,553	54,572
Effect of dilutive stock options (in shares)	493	523
Diluted earnings per common share - weighted-average shares and assumed conversions (in shares)	55,046	55,095
Basic earnings per common share (in dollars per share)	$ 0.25	$ 0.19
Diluted earnings per common share (in dollars per share)	$ 0.25	$ 0.19

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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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