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Note 16 - Quarterly Financial Information (Unaudited) (Details Textual) - USD ($) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2019 | Dec. 31, 2018
Share-based Payment Arrangement, Expense |  |  |  | $ 3,043,000 | $ 1,519,000
Revision of Prior Period, Adjustment [Member] |  |  |  |  |
Share-based Payment Arrangement, Expense | $ 175,000 | $ 172,000 | $ (75,000) |  |
Revision of Prior Period, Error Correction, Adjustment [Member] |  |  |  |  |
Business Combination, Contingent Consideration, Liability, Total | $ (439,000) | $ (439,000) |  |  |

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