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Note 1 - Organization and Summary of Significant Accounting Policies (Tables) | 12 Months Ended
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Dec. 31, 2018
Notes Tables |
Property, Plant and Equipment [Table Text Block] |
Classification |  | Useful life in years |
Machinery and equipment |  |  | 3 | - | 5 |
Furniture and fixtures |  |  | 5 | - | 7 |
Building |  |  |  | 39 |  |
(in thousands) |  | 2018 |  |  | 2017 |
Machinery and equipment |  | $ | 3,321 |  |  | $ | 2,519 |
Furniture and fixtures |  |  | 194 |  |  |  | 153 |
Building |  |  | 313 |  |  |  | 308 |
Subtotal |  |  | 3,828 |  |  |  | 2,980 |
Accumulated depreciation |  |  | (2,315 | ) |  |  | (1,718 | )
Property and equipment, net |  | $ | 1,513 |  |  | $ | 1,262 |
Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions [Table Text Block] |
Year ended December 31, |  | 2018 |  |  | 2017 |
Risk free interest rate |  |  | 1.91 | % |  |  | 0.98 | %
Expected life of option in years |  |  | 10 |  |  |  | 10 |
Expected dividend yield rate |  |  | 0 | % |  |  | 0 | %
Expected volatility |  |  | 52 | % |  |  | 52 | %
Schedule of New Accounting Pronouncements and Changes in Accounting Principles [Table Text Block] |
(in thousands) |  | Dec. 31, 2017 |
R evenue |  |  |  |
Services |  | $ | 636 |
Products |  |  | (759 | )
Total net revenue |  |  | (123 | )
Cost of Revenue |  |  |  |
Services |  |  | 209 |
Products |  |  | (233 | )
Total cost of revenue |  |  | (24 | )
Net Income (loss) |  | $ | (99 | )

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