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Note 2 - Fair Value Measurement (Details Textual)
12 Months Ended
Dec. 31, 2021
USD ($)
Dec. 31, 2020
USD ($)
Dec. 31, 2019
USD ($)
Oct. 01, 2020
USD ($)
Jun. 30, 2020
USD ($)
Nov. 10, 2019
Apr. 01, 2019
Business Combination, Contingent Consideration Arrangements, Change in Amount of Contingent Consideration, Liability $ 2,875,000 $ 1,575,000 $ 50,000        
Business Combination, Contingent Consideration, Liability, Total   221,000     $ 388,000    
Astero [Member]              
Business Combination, Contingent Consideration Arrangements, Change in Amount of Contingent Consideration, Liability (81,000)            
Business Combination, Contingent Consideration, Liability, Total   81,000          
CBS Acquisition [Member]              
Business Combination, Contingent Consideration, Liability, Total 140,000            
SciSafe Holdings, Inc [Member]              
Business Combination, Contingent Consideration Arrangements, Change in Amount of Contingent Consideration, Liability 3,000,000.0 3,300,000          
Business Combination, Contingent Consideration, Liability, Total $ 9,900,000 $ 6,900,000   $ 3,700,000      
Measurement Input, Discount Rate [Member] | Astero [Member]              
Business Combination, Contingent Consideration, Liability, Measurement Input             0.175
Measurement Input, Discount Rate [Member] | CBS Acquisition [Member]              
Business Combination, Contingent Consideration, Liability, Measurement Input 0.210         0.260  
Measurement Input, Discount Rate [Member] | SciSafe Holdings, Inc [Member]              
Business Combination, Contingent Consideration, Liability, Measurement Input 0.071     0.045      
Measurement Input, Risk Free Interest Rate [Member]              
Warrants and Rights Outstanding, Measurement Input   0.001 0.019        
Measurement Input, Risk Free Interest Rate [Member] | CBS Acquisition [Member]              
Business Combination, Contingent Consideration, Liability, Measurement Input 0.0023         0.0174  
Measurement Input, Risk Free Interest Rate [Member] | SciSafe Holdings, Inc [Member]              
Business Combination, Contingent Consideration, Liability, Measurement Input 0.0085     0.0020      
Measurement Input, Risk Free Interest Rate [Member] | Minimum [Member] | Astero [Member]              
Business Combination, Contingent Consideration, Liability, Measurement Input             0.0229
Measurement Input, Risk Free Interest Rate [Member] | Maximum [Member] | Astero [Member]              
Business Combination, Contingent Consideration, Liability, Measurement Input             0.0241
Measurement Input, Price Volatility [Member]              
Warrants and Rights Outstanding, Measurement Input   0.568 0.703        
Measurement Input, Price Volatility [Member] | Astero [Member]              
Business Combination, Contingent Consideration, Liability, Measurement Input             0.56
Measurement Input, Price Volatility [Member] | CBS Acquisition [Member]              
Business Combination, Contingent Consideration, Liability, Measurement Input 0.63         0.70  
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          
Measurement Input, Asset Price Volatility [Member] | SciSafe Holdings, Inc [Member]              
Business Combination, Contingent Consideration, Liability, Measurement Input 0.72     0.60      
Measurement Input, Revenue Volatility [Member] | SciSafe Holdings, Inc [Member]              
Business Combination, Contingent Consideration, Liability, Measurement Input 0.27     0.15      
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