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Note 16 - Subsequent Events (Details Textual) - USD ($)
$ in Thousands
1 Months Ended
Feb. 28, 2021
Jan. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Syapse, Inc. [Member]        
Equity Method Investment, Ownership Percentage     18.90% 20.00%
Subsequent Event [Member] | Syapse, Inc. [Member]        
Equity Method Investment, Ownership Percentage 11.00%      
Subsequent Event [Member] | Syapse, Inc. [Member]        
Proceeds from Issuance of Preferred Stock and Preference Stock $ 68,000      
Subsequent Event [Member] | WebLinc, Inc. [Member]        
Proceeds from Sale of Equity Method Investments   $ 3,200    
Disposal Group, Including Discontinued Operation, Period of Contingent Proceeds (Month)   24 months    
Subsequent Event [Member] | QuanticMind [Member]        
Proceeds from Sale of Equity Method Investments   $ 0