Note 4 - Components of Common Shares Outstanding (Details) - shares	3 Months Ended
	Jun. 30, 2015	Jun. 30, 2014
Basic (in shares)	4,854,841	4,851,043
Stock options (in shares)	6,007	15,814
Warrants (in shares)		602
Shares used in computing net income per share – diluted (in shares)	4,860,848	4,867,459