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Note 2 - Summary of Significant Accounting Policies (Details Textual) $ in Thousands | 3 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Dec. 31, 2020 USD ($) | Mar. 31, 2020 USD ($) | Dec. 31, 2020 USD ($) | Dec. 31, 2019 USD ($) | Dec. 31, 2018 USD ($) | Jan. 01, 2020 USD ($)
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax, Total |  |  | $ 1,300 | $ (400) | $ (700) |
Foreign Currency Transaction Gain (Loss), before Tax, Total |  |  | 300 | (300) | (400) |
Contract with Customer, Liability, Total | $ 200 |  | 200 | 0 |  |
Debt Securities, Available-for-sale, Noncurrent | 0 |  | $ 0 | 0 |  |
Number of Reporting Units |  |  | 2 |  |  |
Goodwill, Impairment Loss | $ 24,400 | $ 18,100 | $ 42,520 | $ 0 | $ 0 |
Number of Operating Segments |  |  | 1 |  |  |
Number of Reportable Segments |  |  | 1 |  |  |
Accounting Standards Update 2016-13 [Member] |  |  |  |  |  |
Debt Securities, Available-for-sale, Allowance for Credit Loss, Ending Balance |  |  |  |  |  | $ 0
Minimum [Member] |  |  |  |  |  |
Property, Plant and Equipment, Useful Life (Year) |  |  | 5 years |  |  |
Maximum [Member] |  |  |  |  |  |
Property, Plant and Equipment, Useful Life (Year) |  |  | 16 years |  |  |
Revenue Benchmark [Member] | Customer Concentration Risk [Member] | DePuy Mitek Inc [Member] |  |  |  |  |  |
Concentration Risk, Percentage |  |  | 49.00% | 71.00% |  |
Accounts Receivable [Member] | Customer Concentration Risk [Member] | DePuy Mitek Inc [Member] |  |  |  |  |  |
Concentration Risk, Percentage |  |  | 44.00% | 70.00% |  |
DePuy Mitek Inc [Member] |  |  |  |  |  |
Revenues From Agreements as Percent of Total Revenue |  |  | 49.00% | 71.00% |  |

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