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Note 2 - Business Acquisition (Details Textual) - USD ($)
3 Months Ended
Mar. 01, 2022
Apr. 30, 2022
Feb. 28, 2022
Feb. 25, 2022
Bank of America, N.A. [Member]        
Debt Instrument, Face Amount     $ 17,000,000.0 $ 17,000,000
Microlab/FXR LLC [Member]        
Business Acquisition, Percentage of Voting Interests Acquired 100.00%      
Business Combination, Consideration Transferred, Total $ 24,250,000      
Microlab/FXR LLC [Member] | Selling, General and Administrative Expenses [Member]        
Business Combination, Acquisition Related Costs   $ 1,200,000    
Microlab/FXR LLC [Member] | Minimum [Member]        
Finite-Lived Intangible Asset, Useful Life (Year) 1 year      
Microlab/FXR LLC [Member] | Maximum [Member]        
Finite-Lived Intangible Asset, Useful Life (Year) 10 years