Quarterly report pursuant to Section 13 or 15(d)

Note 10 - Stock-based Compensation - Vesting Terms of Options Granted (Details)

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Note 10 - Stock-based Compensation - Vesting Terms of Options Granted (Details) - shares
shares in Thousands
 3 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Stock options granted in the period (in shares) 6,109 1,414
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
Options with Four Year Vesting [Member]    
Stock options granted in the period (in shares) 4,947 1,079