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Note 2 - Revenue and Product Costs - Contract Liabilities (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2023
Dec. 31, 2022
Balance at January 1, 2023 $ 333  
Balance at March 31, 2023 291  
Current portion 169 $ 166
Long-term portion 122 $ 167
Customer Deposits [Member]    
Balance at January 1, 2023 0  
Additions, net 1  
Transfer to revenue 0  
Balance at March 31, 2023 1  
Current portion 1  
Long-term portion 0  
Deferred Revenue [Member]    
Balance at January 1, 2023 333  
Additions, net 30  
Transfer to revenue (72)  
Balance at March 31, 2023 291  
Current portion 169  
Long-term portion $ 122