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

12 Months Ended

Dec. 31, 2012

Schedule of Inventory, Current [Table Text Block]

(in thousands)	2012		2011
Raw materials	$	795	$	760
Finished goods		87		64
Total inventories	$	882	$	824

Schedule of Capital Leased Assets [Table Text Block]

(in thousands)	2012			2011
Cost of leased equipment	$	1,139		$	1,028
Accumulated depreciation		(878	)		(784	)
Carrying value of leased equipment	$	261		$	244

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

(in thousands)	2012			2011
Patents	$	485		$	464
Accumulated amortization		(378	)		(331	)
Patents, net	$	107		$	133

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

(in thousands)
2013	$	48
2014		45
2015		3
2016		3
2017 & thereafter		8
Total amortization expense	$	107

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

Year ended December 31,	2012			2011
Risk free interest rate		1.75	%		0.6	%
Expected life of option in years		10			10
Expected dividend yield rate		0	%		0	%
Expected volatility		74	%		63	%

Usefule Lives [Member]

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]

Property, Plant and Equipment [Table Text Block]

(in thousands)	2012			2011
Machinery and equipment	$	4,006		$	3,682
Furniture and fixtures		155			155
Leasehold improvements		277			277
Building		665			590
Subtotal		5,103			4,704
Accumulated depreciation		(3,959	)		(3,482	)
Property and equipment, net	$	1,144		$	1,222