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Note 2 - Fair Value Measurement (Details Textual)
9 Months Ended
Sep. 30, 2020
USD ($)
Jun. 30, 2020
USD ($)
Dec. 31, 2019
USD ($)
Nov. 10, 2019
Apr. 01, 2019
USD ($)
Business Combination, Contingent Consideration, Liability, Total $ 386,000 $ 388,000      
Astero [Member]          
Business Combination, Contingent Consideration, Liability, Total 80,000   $ 1,100,000   $ 1,500,000
CBS Acquisition [Member]          
Business Combination, Contingent Consideration, Liability, Total $ 306,000   $ 856,000    
Measurement Input, Risk Free Interest Rate [Member] | CBS Acquisition [Member]          
Business Combination, Contingent Consideration, Liability, Measurement Input 0.25     1.74  
Measurement Input, Discount Rate [Member] | Astero [Member]          
Business Combination, Contingent Consideration, Liability, Measurement Input 12.5       17.5
Measurement Input, Discount Rate [Member] | CBS Acquisition [Member]          
Business Combination, Contingent Consideration, Liability, Measurement Input 23.0     26.0  
Measurement Input, Price Volatility [Member] | Astero [Member]          
Business Combination, Contingent Consideration, Liability, Measurement Input 64       90
Measurement Input, Price Volatility [Member] | CBS Acquisition [Member]          
Business Combination, Contingent Consideration, Liability, Measurement Input 63     70  
Minimum [Member] | Measurement Input, Risk Free Interest Rate [Member] | Astero [Member]          
Business Combination, Contingent Consideration, Liability, Measurement Input 0.08       2.30
Minimum [Member] | Measurement Input, Price Volatility [Member]          
Warrants and Rights Outstanding, Measurement Input 0.640        
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 0.12       2.43
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 5        
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 50