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Note 1 - Organization and Summary of Significant Accounting Policies (Tables) | 12 Months Ended
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Dec. 31, 2019
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) |  | 201 9 |  |  | 201 8 |
Machinery and equipment |  | $ | 4,995 |  |  | $ | 3,321 |
Furniture and fixtures |  |  | 203 |  |  |  | 194 |
Building |  |  | 301 |  |  |  | 313 |
Subtotal |  |  | 5,499 |  |  |  | 3,828 |
Accumulated depreciation |  |  | (3,322 | ) |  |  | (2,315 | )
Property and equipment, net |  | $ | 2,177 |  |  | $ | 1,513 |
Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions [Table Text Block] |
Year ended December 31, |  | 201 9 |  |  | 201 8 |
Risk free interest rate |  |  | 2.58 | % |  |  | 1.91 | %
Expected life of option in years |  |  | 10 |  |  |  | 10 |
Expected dividend yield rate |  |  | 0 | % |  |  | 0 | %
Expected volatility |  |  | 51 | % |  |  | 52 | %

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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://fasb.org/us-gaap/role/ref/legacyRef -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 2: http://fasb.org/us-gaap/role/ref/legacyRef -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 + Details
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