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Note 1 - Organization and Summary of Significant Accounting Policies (Tables) | 12 Months Ended
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Dec. 31, 2016
Notes Tables |
Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions [Table Text Block] |
Year ended December 31, |  | 2016 |  |  | 2015 |
Risk free interest rate |  |  | .28 | % |  |  | .27 | %
Expected life of option in years |  |  | 10 |  |  |  | 10 |
Expected dividend yield rate |  |  | 0 | % |  |  | 0 | %
Expected volatility |  |  | 65 | % |  |  | 66 | %
Components [Member] |
Notes Tables |
Property, Plant and Equipment [Table Text Block] |
(in thousands) |  | 201 6 |  |  | 201 5 |
Machinery and equipment |  | $ | 1,696 |  |  | $ | 2,178 |
Furniture and fixtures |  |  | 154 |  |  |  | 197 |
Leasehold improvements |  |  | 0 |  |  |  | 258 |
Building |  |  | 308 |  |  |  | 308 |
Subtotal |  |  | 2,158 |  |  |  | 2,941 |
Accumulated depreciation |  |  | (1,458 | ) |  |  | (2,305 | )
Property and equipment, net |  | $ | 700 |  |  | $ | 636 |
Useful Lives [Member] |
Notes Tables |
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 |

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