Note 7 - Stock-based Compensation - Summary of Stock Option Activity (Details) - shares	3 Months Ended	9 Months Ended
	Dec. 31, 2016	Dec. 31, 2016	Dec. 31, 2015
Outstanding (in shares)		40,000
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross	0	0	0
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period	0	0	0
Canceled (forfeited/expired) (in shares)		(30,000)
Outstanding (in shares)	10,000	10,000
Exerciseable (in shares)	10,000	10,000