Note 16 - Stock-based Compensation - Restricted Stock Awards (Details) - Restricted Stock Award 2018 and 2021 [Member]	9 Months Ended
	Sep. 30, 2021 $ / shares shares
Unvested, number of shares (in shares) | shares	500,000
Unvested, weighted average grant date fair value (in dollars per share) | $ / shares	$ 5.73
Granted (in shares) | shares	1,060,000
Granted, weighted average grant date fair value (in dollars per share) | $ / shares	$ 4.64
Vested, number of shares (in shares) | shares	(225,262)
Vested, weighted average grant date fair value (in dollars per share) | $ / shares	$ 4.64
Cancelled for Tax Withholding, number of shares (in shares) | shares	(94,738)
Cancelled for Tax Withholding, weighted average grant date fair value (in dollars per share) | $ / shares	$ 4.64
Unvested, number of shares (in shares) | shares	1,240,000
Unvested, weighted average grant date fair value (in dollars per share) | $ / shares	$ 5.08