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Note 1 - Organization and Summary of Significant Accounting Policies (Tables) | 12 Months Ended
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Dec. 31, 2014
Note 1 - Organization and Summary of Significant Accounting Policies (Tables) [Line Items] |
Schedule of Inventory, Current [Table Text Block] |
(in thousands) |  | 201 4 |  |  | 201 3 |
Raw materials |  | $ | 879 |  |  | $ | 940 |
Finished goods |  |  | 163 |  |  |  | 166 |
Total inventories |  | $ | 1,042 |  |  | $ | 1,106 |
Schedule of Capital Leased Assets [Table Text Block] |
(in thousands) |  | 201 4 |  |  | 201 3 |
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) |  | 201 4 |  |  | 201 3 |
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, |  | 201 4 |  |  | 201 3 |
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) |  | 201 4 |  |  | 201 3 |
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 |

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- Definition Tabular disclosure of physical assets used in the normal conduct of business and not intended for resale. Includes, but is not limited to, balances by class of assets, depreciation and depletion expense and method used, including composite depreciation, and accumulated deprecation. + References Reference 1: 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 2: 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 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 13 -Subparagraph b -Article 5 + Details
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