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Note 18 - Subsequent Events (Details Textual) - USD ($)
$ / shares in Units, $ in Millions
12 Months Ended
Mar. 21, 2022
Mar. 17, 2022
Feb. 18, 2022
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross (in shares)       5,611,658 11,537,242 5,333,452
Subsequent Event [Member]            
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross (in shares) 689,406          
Share-based Compensation Arrangement by Share-based Payment Award, Options and Equity Instruments Other than Options , Grants in Period, Value $ 26.3          
Subsequent Event [Member] | Restricted Stock Units (RSUs) [Member]            
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period (in shares) 4,159,532          
Subsequent Event [Member] | Share Repurchase Program [Member]            
Stock Repurchase Program, Authorized Amount   $ 150.0        
Treasury Stock, Shares, Acquired (in shares)   135,000        
Treasury Stock Acquired, Average Cost Per Share (in dollars per share)   $ 5.49        
I-Access Solutions Pte. Ltd. [Member] | Subsequent Event [Member]            
Business Combination, Consideration Transferred, Total     $ 7.4      
Payments to Acquire Businesses, Gross     1.5      
I-Access Solutions Pte. Ltd. [Member] | Subsequent Event [Member] | Ordinary Shares of EduTech [Member]            
Business Combination, Consideration Transferred, Equity Interests Issued and Issuable     $ 5.9      
Business Combination, Consideration Transferred, Equity Interests Issued and Issuable, Percentage Held in Escrow     9.50%