Note 1 - Summary of Significant Accounting Policies (Tables)

12 Months Ended

Mar. 31, 2014

Accounting Policies [Abstract]

Schedule of Product Warranty Liability [Table Text Block]

	Year Ended March 31,
	2014			2013
Beginning Balance	$	209,000		$	253,000
Amounts charged to expense		357,000			184,000
Actual warranty costs paid		(324,000	)		(228,000	)
Ending Balance	$	242,000		$	209,000