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Note 13 - Restructuring (Details Textual) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Mar. 20, 2023
Mar. 31, 2023
Dec. 31, 2023
Mar. 31, 2024
Restructuring and Related Cost, Number of Positions Eliminated, Period Percent 28.00%      
Restructuring and Related Cost, Number of Positions Eliminated 23      
Restructuring and Related Cost, Expected Cost Remaining       $ 0
Employee Severance [Member]        
Restructuring Costs   $ 100 $ 200  
Xoft Inc [Member]        
Restructuring and Related Cost, Number of Positions Eliminated, Period Percent 50.00%      
Restructuring and Related Cost, Number of Positions Eliminated 12