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Note 6 - Fair Value of Financial Instruments (Details Textual) - USD ($)
$ in Millions
12 Months Ended
Mar. 31, 2023
Dec. 31, 2022
Dec. 22, 2021
Dec. 31, 2021
Contech Medical, Inc and DAS Medical [Member]        
Business Combination, Consideration Transferred, Liabilities Incurred $ 20.0 $ 20.0   $ 25.0
Business Combination, Contingent Consideration, Liability, Total 9.7      
DAS Medical [Member]        
Present Value of Non-competition Agreement $ 7.9      
DAS Medical [Member] | Non-Competition Agreements [Member]        
Payments to Acquire Businesses, Gross     $ 10.0  
Business Combination, Agreement Term (Year)     10 years