Note 13 - Stock-based compensation and purchase plans (Tables)

12 Months Ended

Jun. 30, 2013

Note 13 - Stock-based compensation and purchase plans (Tables) [Line Items]

Schedule of Share-based Compensation, Restricted Stock Units Award Activity [Table Text Block]

	Restricted Stock Awards
	Number of Shares			Aggregate Intrinsic Value
Outstanding, June 30, 2012		207,989		$	8,854,092
Granted		44,388
Exercised / vested		(78,337	)		3,525,711
Canceled		(1,550	)
Outstanding, June 30, 2013		172,490		$	9,098,848

Schedule of Share-based Compensation, Stock Options, Activity [Table Text Block]

	Annual Component							Performance Stock Units
	Number of Shares			Weighted Average Exercise Price		Aggregate Intrinsic Value		Number of Shares			Aggregate Intrinsic Value
Non-vested, June 30, 2012		94,916		$	17.89	$	2,342,302		86,220		$	3,670,385
Granted		33,654			31.93				15,337
Vested		(22,603	)		11.66		777,470		(58,389	)		3,080,038
Expired		0			-				(2,164	)
Non-vested, June 30, 2013		105,967		$	23.68	$	1,683,260		41,004		$	2,162,926

Executive Compensation Program [Member]

Note 13 - Stock-based compensation and purchase plans (Tables) [Line Items]

Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions [Table Text Block]

	2013			2012			2011
Risk-free interest rates		0.25	%		0.25	%		0.68	%
Expected life of option grants (in years)		3			3			3
Expected volatility of underlying stock		47.4	%		63.2	%		65.4	%
Expected quarterly dividends (per share)	$	0.07		$	0.06		$	0.05