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Note 8 - Accrued Liabilities (Tables) | 12 Months Ended
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Dec. 31, 2019
Notes Tables |
Schedule of Accrued Liabilities [Table Text Block] |
|  | December 31, |
|  | 2019 |  |  | 2018 |
Payroll expenses and tax payable |  | $ | 299,000 |  |  | $ | 269,000 |
Commission and bonuses payable and general accrued liabilities |  |  | 621,000 |  |  |  | 1,073,000 |
Total accrued liabilities |  | $ | 920,000 |  |  | $ | 1,342,000 |

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