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Note 5 - Trade Accounts and Notes Receivable (Details Textual) - USD ($)
$ in Thousands
3 Months Ended 39 Months Ended
Mar. 31, 2022
Mar. 31, 2020
Mar. 31, 2023
Sep. 30, 2022
Financing Receivable, after Allowance for Credit Loss     $ 4,983 $ 8,225
Promissory Note for Sale of Rental Equipment [Member]        
Financing Receivable, before Allowance for Credit Loss, Total $ 8,000      
Notes Receivable, Term (Year) 1 year      
Financing Receivable, after Allowance for Credit Loss     2,000  
Promissory Note for Sale of Product [Member]        
Financing Receivable, before Allowance for Credit Loss, Total   $ 10,000    
Notes Receivable, Term (Year)   3 years    
Financing Receivable, after Allowance for Credit Loss     3,000  
Notes Receivable, Periodic Payment   $ 300    
Proceeds from Collection of Notes Receivable     $ 9,500  
Rental Equipment [Member]        
Disposal Group, Including Discontinued Operation, Consideration $ 10,000      
Product [Member]        
Disposal Group, Including Discontinued Operation, Consideration   $ 12,500    
Minimum [Member]        
Notes Receivable, Interest Rate, Stated Percentage     7.00%  
Maximum [Member]        
Notes Receivable, Interest Rate, Stated Percentage     9.50%