Note 11 - Stock-based Compensation - Restricted Stock Awards Activities (Details) - Restricted Stock [Member] shares in Thousands	6 Months Ended
	Jun. 30, 2022 $ / shares shares
Nonvested, number of shares (in shares)	1,750
Nonvested, weighted average grant date fair value per share (in dollars per share) | $ / shares	$ 44.000
Restricted stock granted, number of shares (in shares)	6,317
Restricted stock granted, weighted average grant date fair value per share (in dollars per share) | $ / shares	$ 37.000
Vested (in shares)	(750)
Forfeited (in shares)	(230)
Nonvested, number of shares (in shares)	7,087
Nonvested, weighted average grant date fair value per share (in dollars per share) | $ / shares	$ 37.000