Note 2 - Weighted Average Number of Shares (Details) - shares	12 Months Ended
	Mar. 31, 2016	Mar. 31, 2015	Mar. 31, 2014
Basic (in shares)	4,850,209	4,855,504	4,851,460
Stock options (in shares)	2,393	16,431	15,639
Warrants (in shares)			592
Shares used in computing net income per share – diluted (in shares)	4,852,602	4,871,935	4,867,691