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Note 2 - Fair Value Measurement (Details Textual)
12 Months Ended
Dec. 31, 2020
USD ($)
Dec. 31, 2019
USD ($)
Oct. 01, 2020
USD ($)
Jun. 30, 2020
USD ($)
Nov. 10, 2019
Apr. 01, 2019
USD ($)
Business Combination, Contingent Consideration, Liability, Total $ 221,000     $ 388,000    
Business Combination, Contingent Consideration Arrangements, Change in Amount of Contingent Consideration, Liability 1,575,000 $ 50,000        
Astero [Member]            
Business Combination, Contingent Consideration, Liability, Total 81,000 1,100,000       $ 1,500,000
CBS Acquisition [Member]            
Business Combination, Contingent Consideration, Liability, Total 140,000 $ 856,000        
SciSafe Holdings, Inc [Member]            
Business Combination, Contingent Consideration, Liability, Total 6,900,000   $ 3,700,000      
Business Combination, Contingent Consideration Arrangements, Change in Amount of Contingent Consideration, Liability $ 3,300,000          
Measurement Input, Risk Free Interest Rate [Member]            
Warrants and Rights Outstanding, Measurement Input 0.001 0.019        
Measurement Input, Risk Free Interest Rate [Member] | Astero [Member]            
Business Combination, Contingent Consideration, Liability, Measurement Input 0.0011          
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 0.0022   0.0020      
Measurement Input, Discount Rate [Member] | Astero [Member]            
Business Combination, Contingent Consideration, Liability, Measurement Input 0.110         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 0.045   0.045      
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 0.766         0.56
Measurement Input, Price Volatility [Member] | CBS Acquisition [Member]            
Business Combination, Contingent Consideration, Liability, Measurement Input 0.63       0.70  
Measurement Input, Asset Price Volatility [Member] | SciSafe Holdings, Inc [Member]            
Business Combination, Contingent Consideration, Liability, Measurement Input 0.61   0.60      
Measurement Input, Revenue Volatility [Member] | SciSafe Holdings, Inc [Member]            
Business Combination, Contingent Consideration, Liability, Measurement Input 0.15   0.15      
Minimum [Member] | Measurement Input, Risk Free Interest Rate [Member] | Astero [Member]            
Business Combination, Contingent Consideration, Liability, Measurement Input           0.0229
Minimum [Member] | Measurement Input, Price Volatility [Member]            
Warrants and Rights Outstanding, Measurement Input 0.568          
Maximum [Member]            
Warrants and Rights Outstanding, Term (Year) 1 year          
Maximum [Member] | Measurement Input, Risk Free Interest Rate [Member] | Astero [Member]            
Business Combination, Contingent Consideration, Liability, Measurement Input           0.0241
Maximum [Member] | Measurement Input, Price Volatility [Member]            
Warrants and Rights Outstanding, Measurement Input 0.846          
Convertible Debt Securities [Member] | Measurement Input, Risk Free Interest Rate [Member]            
Debt Securities, Trading, Measurement Input 0.080          
Convertible Debt Securities [Member] | Minimum [Member]            
Debt Securities, Term (Year) 1 year          
Convertible Debt Securities [Member] | Minimum [Member] | Measurement Input, Prepayment Rate [Member]            
Debt Securities, Trading, Measurement Input 0.05          
Convertible Debt Securities [Member] | Maximum [Member]            
Debt Securities, Term (Year) 2 years          
Convertible Debt Securities [Member] | Maximum [Member] | Measurement Input, Prepayment Rate [Member]            
Debt Securities, Trading, Measurement Input 0.50