Note 2 - Summary of Significant Accounting Policies (Tables)

12 Months Ended

Mar. 31, 2018

Notes Tables

Schedule of Weighted Average Number of Shares [Table Text Block]

	Year Ended March 31
	2018		2017		2016
Weighted average common shares outstanding – basic	4,841,347	4,836,602		4,850,209
Dilutive effect of stock options	4,865		1,787		2,393
Shares used in computing net income per share – diluted	4,846,212		4,838,389		4,852,602