Note 1 - Summary of Significant Accounting Policies (Tables)

12 Months Ended

Mar. 31, 2013

Schedule of Product Warranty Liability [Table Text Block]

	Year Ended March 31,
	2013			2012
Beginning Balance	$	253,000		$	162,000
Amounts charged to expense		184,000			489,000
Actual warranty costs paid		(228,000	)		(398,000	)
Ending Balance	$	209,000		$	253,000