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Note 2 - Summary of Significant Accounting Policies (Details Textual) - USD ($) $ in Thousands	3 Months Ended		12 Months Ended
	Dec. 31, 2020	Mar. 31, 2020	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018	Jan. 01, 2020
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
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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