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Note 2 - Revenue and Product Costs - Contract Liabilities (Details) - USD ($)
$ in Thousands
9 Months Ended
Sep. 30, 2023
Dec. 31, 2022
Balance $ 333  
Balance 365  
Current portion 189 $ 166
Long-term portion 176 $ 167
Customer Deposits [Member]    
Balance 0  
Additions, net 2  
Transfer to revenue 0  
Balance 2  
Current portion 2  
Long-term portion 0  
Deferred Revenue [Member]    
Balance 333  
Additions, net 229  
Transfer to revenue (197)  
Balance 365  
Current portion 189  
Long-term portion $ 176