Note 14 - Stock Based Compensation - Stock Option Activity (Details) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Outstanding, shares (in shares)			7,067,436
Outstanding, weighted average exercise price per share (in dollars per share)			$ 2.74
Granted (in shares)	175,000	225,000	3,818,921	3,140,000
Granted, weighted average exercise price per share (in dollars per share)			$ 2.98
Granted, aggregate intrinsic value			$ 99,800
Exercised (in shares)	(699,410)	(225,000)	(699,410)	(225,000)
Exercised, weighted average exercise price per share (in dollars per share)	$ 2.46	$ 2.40	$ 2.46	$ 2.40
Exercised, aggregate intrinsic value			$ 2,753,652
Forfeited (in shares)			(75,000)
Forfeited, weighted average exercise price per share (in dollars per share)			$ 3.05
Expired (in shares)			(223)
Expired, weighted average exercise price per share (in dollars per share)			$ 225.00
Outstanding, shares (in shares)	10,111,724		10,111,724
Outstanding, weighted average exercise price per share (in dollars per share)	$ 2.84		$ 2.84
Outstanding, weighted average contractual life remaining in years (Year)			8 years 6 months 10 days
Outstanding, aggregate intrinsic value	$ 11,697,962		$ 11,697,962
Exercisable, shares (in shares)	5,663,935		5,663,935
Exercisable, Weighted average exercise price per share (in dollars per share)	$ 2.94		$ 2.94
Exercisable, weighted average contractual life remaining in years (Year)			7 years 10 months 13 days
Exercisable, aggregate intrinsic value	$ 9,039,985		$ 9,039,985
Vested and expected to vest, shares (in shares)	10,111,724		10,111,724
Vested and expected to vest, Weighted average exercise price per share (in dollars per share)	$ 2.84		$ 2.84
Vested and expected to vest, weighted average contractual life remaining in years (Year)			8 years 6 months 10 days
Vested and expected to vest, aggregate intrinsic value	$ 11,697,962		$ 11,697,962