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Note 2 - Revenue and Product Costs - Contract Liabilities (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Customer Deposits [Member]    
Balance $ 0  
Additions, net 1,002  
Transfer to revenue 0  
Balance 1,002  
Current portion 1,002  
Long-term portion 0  
Extended Warranties and Services, VR, and Training [Member]    
Balance 333  
Additions, net 407  
Transfer to revenue (196)  
Balance 544  
Current portion 407 $ 166
Long-term portion $ 137 $ 167