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, 2023	Mar. 31, 2022	Dec. 31, 2022
Numerator:
Net income	$ 22,502	$ 27,533	$ 82,821
Denominator:
Basic earnings per common share - weighted-average shares (in shares)	81,210	82,938
Effect of dilutive stock options (in shares)	166	308
Diluted earnings per common share - weighted-average shares and assumed conversions (in shares)	81,376	83,246
Basic earnings per common share (in dollars per share)	$ 0.28	$ 0.33
Diluted earnings per common share (in dollars per share)	$ 0.28	$ 0.33