Note 1 - Description of Business and Summary of Accounting Policies (Tables)

12 Months Ended

Mar. 31, 2015

Consolidated Statements of Stockholders' Equity [Member]

Notes Tables

Schedule of Error Corrections and Prior Period Adjustments [Table Text Block]

	Year Ended March 31,
	2014			2013			2012
	(In Thousands)
Accumulated deficit - as reported	$	(9,154	)	$	(8,959	)	$	(13,168	)
Adjustment		(296	)		(71	)		(26	)
Accumulated deficit - as adjusted	$	(9,450	)	$	(9,030	)	$	(13,194	)

Consolidated Statements of Cash Flows [Member]

Notes Tables

Schedule of Error Corrections and Prior Period Adjustments [Table Text Block]

	Year Ended March 31, 2014									Year Ended March 31, 2013
	As Reported			Adjustment			As Adjusted			As Reported			Adjustment			As Adjusted
	(In Thousands)									(In Thousands)
Net (loss) income	$	(195	)	$	(225	)	$	(420	)	$	4,209		$	(45	)	$	4,164
Deferred income taxes		199			(131	)		68			(2,095	)		(26	)	$	(2,121	)
Accounts receivable		419			713			1,132			(1,382	)		123			(1,259	)
Inventories		(1,185	)		(325	)		(1,510	)		(108	)		(49	)		(157	)
Accrued expenses		(98	)		(32	)		(130	)		(480	)		(3	)		(483	)

Consolidated Statements of Operations [Member]

Notes Tables

Schedule of Error Corrections and Prior Period Adjustments [Table Text Block]

	Year Ended March 31, 2014									Year Ended March 31, 2013
	As Reported			Adjustment			As Adjusted			As Reported		Adjustment			As Adjusted
	(In Thousands)									(In Thousands)
Sales	$	28,905		$	(727	)	$	28,178		$	27,581	$	(122	)	$	27,459
Cost of sales		17,341			(352	)		16,989			16,623		(48	)		16,575
Gross profit		11,564			(375	)		11,189			10,958		(74	)		10,884
Income (loss) from operations		165			(375	)		(210	)		2,299		(74	)		2,225
Net income (loss)		(195	)		(225	)		(420	)		4,209		(45	)		4,164
Net income (loss) per share - diluted	$	(0.04	)	$	(0.04	)	$	(0.08	)	$	0.74	$	(0.00	)	$	0.74

Consolidated Balance Sheets [Member]

Notes Tables

Schedule of Error Corrections and Prior Period Adjustments [Table Text Block]

	March 31, 2014
	As Reported		Adjustment			As Adjusted
	(In Thousands)
Accounts receivable	$	3,347	$	(971	)	$	2,376
Inventories, net		4,876		465			5,341
Deferred tax assets		3,340		173			3,513
Total assets		30,310		(333	)		29,977
Accounts payable		3,184		(37	)		3,147
Total current liabilities		4,192		(37	)		4,155
Total equity		20,847		(296	)		20,551

Property, Plant, and Equipment, Estimated Useful Lives [Table Text Block]

Equipment (in years)	3	to	10
Furniture and fixtures (in years)	3	to	7
Leasehold improvements (in years)	10	to	25