Annual report pursuant to Section 13 and 15(d)

Note 12 - Stock-based Compensation (Details Textual)

v3.21.1
Note 12 - Stock-based Compensation (Details Textual) - USD ($)
$ in Thousands
12 Months Ended
Jul. 10, 2020
Jul. 02, 2020
May 05, 2020
Mar. 10, 2020
Sep. 03, 2019
Jun. 03, 2019
Dec. 31, 2020
Dec. 31, 2019
Share-based Compensation Arrangement by Share-based Payment Award, Maximum Subscription Rate             17.50%  
Share-based Compensation Arrangement by Share-based Payment Award, Maximum Number of Shares (in shares)             15,600,000  
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period (Year)             4 years  
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period (Year)             10 years  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period, Intrinsic Value             $ 850 $ 259
Share-based Payment Arrangement, Nonvested Award, Option, Cost Not yet Recognized, Amount             $ 9,520  
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition (Year)             1 year 302 days  
Restricted Stock Units (RSUs) [Member]                
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period (Year)     120 days 90 days        
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period (in shares) 645,000 40,000   645,000   80,000 645,000 80,000
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period (in shares)         40,000   685,000 40,000
Restricted Stock Units (RSUs) [Member] | Share-based Payment Arrangement, Tranche One [Member]                
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period (Year)           90 days    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period (in shares)           40,000    
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage         50.00%      
Restricted Stock Units (RSUs) [Member] | Share-based Payment Arrangement, Tranche Two [Member]                
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period (Year)     1 year 30 days     1 year