Note 1 - Summary of Significant Accounting Policies (Tables)

12 Months Ended

Mar. 31, 2015

Notes Tables

Schedule of Product Warranty Liability [Table Text Block]

	Year Ended March 31,
	2015			2014
Beginning Balance	$	242,000		$	209,000
Amounts charged to expense		169,683			357,000
Actual warranty costs paid		(179,880	)		(324,000	)
Ending Balance	$	231,803		$	242,000