Note 1 - Organization and Summary of Significant Accounting Policies (Tables)

12 Months Ended

Dec. 31, 2014

Note 1 - Organization and Summary of Significant Accounting Policies (Tables) [Line Items]

Schedule of Inventory, Current [Table Text Block]

(in thousands)	2014		2013
Raw materials	$	879	$	940
Finished goods		163		166
Total inventories	$	1,042	$	1,106

Schedule of Capital Leased Assets [Table Text Block]

(in thousands)	2014			2013
Cost of leased equipment	$	514		$	473
Accumulated depreciation		(355	)		(290	)
Carrying value of leased equipment	$	159		$	183

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

(in thousands)	2014			2013
Patents	$	491		$	491
Accumulated amortization		(472	)		(427	)
Patents, net	$	19		$	64

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

(in thousands)
2015	$	4
2016		4
2017		4
2018		4
2019		3
Total amortization expense	$	19

Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions [Table Text Block]

Year ended December 31,	2014			2013
Risk free interest rate		2.5	%		2.5	%
Expected life of option in years		10			10
Expected dividend yield rate		0	%		0	%
Expected volatility		73	%		74	%

Useful Lives [Member]

Note 1 - Organization and Summary of Significant Accounting Policies (Tables) [Line Items]

Property, Plant and Equipment [Table Text Block]

Classification	Useful life in years
Machinery and equipment	3	-	5
Furniture and fixtures	5	-	7
Leasehold improvements	1	-	5
Building		39

Components [Member]

Note 1 - Organization and Summary of Significant Accounting Policies (Tables) [Line Items]

Property, Plant and Equipment [Table Text Block]

(in thousands)	2014			2013
Machinery and equipment	$	4,268		$	3,989
Furniture and fixtures		192			194
Leasehold improvements		281			281
Building		308			308
Subtotal		5,049			4,772
Accumulated depreciation		(3,980	)		(3,627	)
Property and equipment, net	$	1,069		$	1,145