Note 3 - Stock-based Compensation (Detail) - Stock Option Activity: (USD $)	3 Months Ended	6 Months Ended
	Sep. 30, 2012	Dec. 31, 2012	Dec. 31, 2011
Options outstanding at beginning of period	26,240	26,240	42,327
Options outstanding at beginning of period (in Dollars per share)	$ 12.19	$ 12.19	$ 12.17
Exercised		(13,543)	(2,886)
Exercised (in Dollars per share)		$ 12.13	$ 12.13
Granted	10,000	10,000
Granted (in Dollars per share)		$ 16.00
Options outstanding at end of period		22,697	39,441
Options outstanding at end of period (in Dollars per share)		$ 13.91	$ 12.17
Options exercisable at end of period		12,697	39,441