Note 15 - Equity Incentive Plans - Restricted Common Stock and Non-qualified Stock Option Activity (Details) - shares	3 Months Ended								12 Months Ended
	Dec. 31, 2021		Sep. 30, 2021		Jun. 30, 2021		Mar. 31, 2021		Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Vesting Period (Year)									4 years
Number of awards issued/granted (in shares)									4,762,004	0	0
Number of awards issued/granted (in shares)									4,762,004	0	0
Restricted Stock [Member]
Number of shares issued/granted (in shares)	108,685	[1],[2],[3]	3,915,502	[2],[3],[4]	(89,673)	[3],[5]	(121,499)	[6]	3,813,015
Restricted Stock [Member] | Minimum [Member]
Vesting Period (Year)					0 years				2 years
Restricted Stock [Member] | Maximum [Member]
Vesting Period (Year)					4 years				3 years
Non-qualified Stock Options [Member]
Number of shares issued/granted (in shares)					0		0
Number of awards issued/granted (in shares)	76,089	[7],[8]	4,668,727	[7],[9]					4,744,816
Number of awards issued/granted (in shares)	76,089	[7],[8]	4,668,727	[7],[9]					4,744,816
Restricted Stock and Non-qualified Stock Options [Member] | Minimum [Member]
Vesting Period (Year)	2 years		2 years
Restricted Stock and Non-qualified Stock Options [Member] | Maximum [Member]
Vesting Period (Year)	4 years		3 years

[1] Includes restricted stock awards granted to employees on December 10, 2021, December 13, 2021, December 16, 2021 and December 30, 2021.

[2] Includes shares of common stock cancelled related to the unvested restricted stock awards of certain employees.

[3] Includes shares withheld from employees to cover tax withholding obligations upon the vesting of restricted stock awards.

[4] Includes restricted stock awards granted to employees and directors on August 20, 2021.

[5] Includes restricted stock awards granted to employees April 7, 2021, May 3, 2021 and June 7, 2021.

[6] Includes shares of common stock cancelled related to unvested restricted stock awards of a director and an employee who resigned.

[7] Includes non-qualified stock options canceled related to unvested stock option awards granted to employees.

[8] Includes non-qualified stock options granted to employees on December 10, 2021, December 13, 2021, December 16, 2021 and December 30,2021.

[9] Includes non-qualified stock options granted to employees and directors on August 20, 2021.