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Note 2 - Revenue and Product Costs - Contract Liabilities (Details) - USD ($)
$ in Thousands
6 Months Ended
Jun. 30, 2023
Dec. 31, 2022
Balance at January 1, 2023 $ 333  
Balance at June 30, 2023 340  
Current portion 211 $ 166
Long-term portion 129 $ 167
Customer Deposits [Member]    
Balance at January 1, 2023 0  
Additions, net 3  
Transfer to revenue 0  
Balance at June 30, 2023 3  
Current portion 3  
Long-term portion 0  
Deferred Revenue [Member]    
Balance at January 1, 2023 333  
Additions, net 124  
Transfer to revenue (117)  
Balance at June 30, 2023 340  
Current portion 211  
Long-term portion $ 129