Note 2 - Earnings Per Common Share (Detail) - Earnings Per Common Share (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended		9 Months Ended
	Mar. 31, 2013	Mar. 31, 2012	Dec. 31, 2012
Numerator:
Net income (in Dollars)	$ 7,202	$ 5,446	$ 21,821
Denominator:
Basic earnings per common share - weighted-average shares	22,121	22,033
Effect of dilutive stock options	93	108
Diluted earnings per common share - weighted-average shares and assumed conversions	22,214	22,141
Basic earnings per common share (in Dollars per share)	$ 0.33	$ 0.25
Diluted earnings per common share (in Dollars per share)	$ 0.32	$ 0.25