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Note 2 - Revenue and Product Costs - Contract Liabilities (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2024
Dec. 31, 2023
Balance $ 491  
Current portion 363 $ 407
Long-term portion 128 $ 137
Customer Deposits [Member]    
Balance 1,002  
Additions, net 20  
Transfer to revenue (1,002)  
Balance 20  
Current portion 20  
Long-term portion 0  
Deferred Revenue [Member]    
Balance 544  
Additions, net 124  
Transfer to revenue (177)  
Balance 491  
Current portion 363  
Long-term portion $ 128