Note 8 - Stock Based Compensation - Summary of Stock Option Activity (Details) - shares	3 Months Ended		6 Months Ended
	Sep. 30, 2016	Jun. 30, 2016	Sep. 30, 2016	Sep. 30, 2015
Outstanding (in shares)	40,000
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross		0		0
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period			0	0
Canceled (forfeited/expired) (in shares)	(30,000)
Outstanding (in shares)	10,000	40,000	10,000
Exerciseable (in shares)	10,000		10,000