Note 5 - Stock-Based Compensation (Detail) (USD $)	3 Months Ended		6 Months Ended
	Sep. 30, 2012	Jun. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross (in Shares)	2,500
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period (in Shares)		15,000
Share-based Compensation			$ 1,000	$ 1,469
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized, Stock Options	$ 2,700		$ 2,700