Note 4 - Detail of Certain Asset Accounts (Tables)

9 Months Ended

Dec. 26, 2014

Details Of Certain Balance Sheet Accounts Disclosure [Abstract]

Schedule of Inventory, Current [Table Text Block]

	December 26, 2014		March 31, 2014
Raw material	$	3,031,000	$	3,093,000
Work-in-process		848,000		954,000
Finished products		1,108,000		702,000
Inventories, net	$	4,987,000	$	4,749,000

Schedule of Finite-Lived Intangible Assets [Table Text Block]

	Weighted Average	December 26, 2014
	Lives in  Years	Amortization  Method	Carrying Value		Accumulated Amortization		Intangibles Net
Customer list	15	Straight Line	$	190	$	122	$	68
Trademarks	15	Cash Flow		2,270		1,394		876
Technology	10	Cash Flow		10,950		10,851		99
Distribution Rights	7	Straight Line		148		39		109
Patents pending				729		--		729
Patents	10	Straight Line		1,449		652		797
Total Intangibles			$	15,736	$	13,058	$	2,678

	Weighted Average	March 31, 2014
	Lives in  Years	Amortization Method	Carrying  Value		Accumulated  Amortization		Intangibles Net
Customer list	15	Straight Line	$	190	$	113	$	77
Trademarks	15	Cash Flow		2,270		1,267		1,003
Technology	10	Cash Flow		10,950		10,672		278
Distribution Rights	7	Straight Line		148		23		125
Patents pending				795		--		795
Patents	10	Straight Line		1,108		444		664
Total Intangibles			$	15,461	$	12,519	$	2,942

Schedule of Finite-Lived Intangible Assets, Future Amortization Expense [Table Text Block]

Intangible Assets and Patents
Remainder of 2015	$	154
2016		396
2017		351
2018		347
2019		337
2020 & after		364
Total	$	1,949