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Note 6 - Goodwill and Intangible Assets (Tables) | 12 Months Ended
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Dec. 31, 2020
Notes Tables |
Schedule of Finite-Lived Intangible Assets [Table Text Block] |
|  | December 31, 2020 |  |  | December 31, 2019 |
|  | Weighted Average Amortization Period (Years) |  |  | Gross Carrying Amount |  |  | Accumulated Amortization |  |  | Net Carrying Amount |  |  | Weighted Average Amortization Period (Years) |  |  | Gross Carrying Amount |  |  | Accumulated Amortization |  |  | Net Carrying Amount |
Patents and Trademarks |  |  | 3.0 |  |  | $ | 474,000 |  |  | $ | (467,000 | ) |  | $ | 7,000 |  |  |  | 3.0 |  |  | $ | 474,000 |  |  | $ | (463,000 | ) |  | $ | 11,000 |
Schedule of Finite-Lived Intangible Assets, Future Amortization Expense [Table Text Block] |
2021 |  |  | 3,000 |
2022 |  |  | 2,000 |
2023 |  |  | 1,000 |
2024 |  |  | 1,000 |
Total |  | $ | 7,000 |

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