Note 4 - Accrued Expenses (Details) - Accrued Liabilities (USD $) In Thousands, unless otherwise specified	Mar. 31, 2014	Mar. 31, 2013	Mar. 31, 2012
Accrued Liabilities [Abstract]
Interest payable—related party	$ 253	$ 70
Warranty reserve	230	280	303
Accrued accounts payable	108	63
Accrued other	96	75
Accrued accounting fees	90	100
Accrued legal fees	77	41
Sales tax payable	33	27
Accrued travel expenses	31	72
Accrued expenses	$ 918	$ 728