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
	Mar. 31, 2022	Mar. 31, 2021	Dec. 31, 2021
Numerator:
Net income	$ 27,533	$ 18,006	$ 67,422
Denominator:
Basic earnings per common share - weighted-average shares (in shares)	82,938	82,758
Effect of dilutive stock options (in shares)	308	601
Diluted earnings per common share - weighted-average shares and assumed conversions (in shares)	83,246	83,359
Basic earnings per common share (in dollars per share)	$ 0.33	$ 0.22
Diluted earnings per common share (in dollars per share)	$ 0.33	$ 0.22