Note 5 - Stock-Based Compensation (Detail) (USD $)	3 Months Ended		9 Months Ended
	Dec. 31, 2012	Jun. 30, 2011	Dec. 31, 2012	Dec. 31, 2011
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross	10,000
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period		15,000
Share-based Compensation (in Dollars)			$ 7,000	$ 1,469
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized, Stock Options (in Dollars)	$ 16,700		$ 16,700
Director [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross	2,500