Annual report pursuant to Section 13 and 15(d)

Note 12 - Stock-based Compensation - Vesting Terms of Options Granted (Details)

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Note 12 - Stock-based Compensation - Vesting Terms of Options Granted (Details) - shares
shares in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Stock options granted in the period (in shares) 6,362 2,160
Options with Cliff Vesting After One Year Anniversary [Member]    
Stock options granted in the period (in shares) 300 335
Options with Three Year Vesting [Member]    
Stock options granted in the period (in shares) 862 160
Options with Four Year Vesting [Member]    
Stock options granted in the period (in shares) 5,200 1,665