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Note 1 - Organization and Summary of Significant Accounting Policies (Tables) | 12 Months Ended
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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 |

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- Definition Tabular disclosure of the useful life and salvage value of long-lived, physical assets that are used in the normal conduct of business to produce goods and services and not intended for resale. Examples include land, buildings, machinery and equipment, and other types of furniture and equipment including, but not limited to, office equipment, furniture and fixtures, and computer equipment and software. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 13 -Subparagraph b -Article 5 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Principles Board Opinion (APB) -Number 12 -Paragraph 5 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6391035&loc=d3e2868-110229 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.13) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Tabular disclosure of assets, excluding financial assets and goodwill, lacking physical substance with a finite life, by either major class or business segment. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=7658586&loc=d3e16323-109275 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=7658586&loc=d3e16265-109275 + Details
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- Definition Tabular disclosure of the carrying amount as of the balance sheet date of merchandise, goods, commodities, or supplies held for future sale or to be used in manufacturing, servicing or production process. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 2 -Paragraph 6 -Subparagraph a,b,c -Article 5 + Details
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