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Note 3 - Fair Value Measurement (Details Textual)
12 Months Ended
Dec. 31, 2022
USD ($)
Dec. 31, 2021
USD ($)
Dec. 31, 2020
USD ($)
Oct. 01, 2020
USD ($)
Jun. 30, 2020
USD ($)
Business Combination, Contingent Consideration, Liability, Total     $ 221,000   $ 388,000
Business Combination, Contingent Consideration Arrangements, Change in Amount of Contingent Consideration, Liability $ (4,754,000) $ 2,875,000 $ 1,575,000    
SciSafe Holdings, Inc [Member]          
Business Combination, Contingent Consideration, Liability, Total 4,300,000 9,900,000   $ 3,700,000  
Business Combination, Contingent Consideration Arrangements, Change in Amount of Contingent Consideration, Liability $ 5,600,000 $ 3,000,000.0      
Measurement Input, Discount Rate [Member] | SciSafe Holdings, Inc [Member]          
Business Combination, Contingent Consideration, Liability, Measurement Input 0.128     0.045  
Measurement Input, Risk Free Interest Rate [Member] | SciSafe Holdings, Inc [Member]          
Business Combination, Contingent Consideration, Liability, Measurement Input 0.041     0.0020  
Measurement Input, Asset Price Volatility [Member] | SciSafe Holdings, Inc [Member]          
Business Combination, Contingent Consideration, Liability, Measurement Input       0.60  
Measurement Input, Revenue Volatility [Member] | SciSafe Holdings, Inc [Member]          
Business Combination, Contingent Consideration, Liability, Measurement Input 0.30     0.15  
Measurement Input Asset Volatility [Member] | SciSafe Holdings, Inc [Member]          
Business Combination, Contingent Consideration, Liability, Measurement Input 0.68        
Measurement Input, Price Volatility [Member] | Minimum [Member]          
Warrants and Rights Outstanding, Measurement Input     0.568    
Measurement Input, Price Volatility [Member] | Maximum [Member]          
Warrants and Rights Outstanding, Measurement Input     0.846    
Convertible Debt Securities [Member] | Minimum [Member]          
Debt Securities, Term (Year) 1 year        
Convertible Debt Securities [Member] | Maximum [Member]          
Debt Securities, Term (Year) 2 years        
Convertible Debt Securities [Member] | Measurement Input, Prepayment Rate [Member]          
Debt Securities, Trading, Measurement Input 0.080        
Convertible Debt Securities [Member] | Measurement Input, Prepayment Rate [Member] | Minimum [Member]          
Debt Securities, Trading, Measurement Input 0.05        
Convertible Debt Securities [Member] | Measurement Input, Prepayment Rate [Member] | Maximum [Member]          
Debt Securities, Trading, Measurement Input   0.50