Quarterly report pursuant to Section 13 or 15(d)

Note 11 - Stock-based Compensation - Vesting Terms of Options Granted (Details)

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Note 11 - Stock-based Compensation - Vesting Terms of Options Granted (Details) - shares
 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Stock options granted in the period (in shares) 4,199,000 6,352,000
Options with Cliff Vesting After One Year Anniversary [Member]    
Stock options granted in the period (in shares) 0 300,000
Options with Three Year Vesting [Member]    
Stock options granted in the period (in shares) 430,000 862,000
Options with Four Year Vesting [Member]    
Stock options granted in the period (in shares) 2,969,000 5,190,000
Options With Performance Criteria [Member]    
Stock options granted in the period (in shares) 800 0