Note 14 - Stock Based Compensation - Stock Option Activity (Details)	3 Months Ended
	Mar. 31, 2021 USD ($) $ / shares shares
Outstanding, shares (in shares) | shares	7,067,436
Outstanding, weighted average exercise price per share (in dollars per share) | $ / shares	$ 2.74
Granted, shares (in shares) | shares
Granted, weighted average exercise price per share (in dollars per share) | $ / shares
Exercised, shares (in shares) | shares
Exercised, weighted average exercise price per share (in dollars per share) | $ / shares
Forfeited, shares (in shares) | shares
Forfeited, weighted average exercise price per share (in dollars per share) | $ / shares
Expired, shares (in shares) | shares
Expired, weighted average exercise price per share (in dollars per share) | $ / shares
Outstanding, shares (in shares) | shares	7,067,436
Outstanding, weighted average exercise price per share (in dollars per share) | $ / shares	$ 2.74
Outstanding, weighted average contractual life remaining in years (Year)	8 years 131 days
Outstanding, aggregate intrinsic value | $	$ 3,865,800
Exercisable, shares (in shares) | shares	5,108,435
Exercisable, Weighted average exercise price per share (in dollars per share) | $ / shares	$ 3.05
Exercisable, weighted average contractual life remaining in years (Year)	8 years 32 days
Exercisable, aggregate intrinsic value | $	$ 2,943,244
Vested and expected to vest, shares (in shares) | shares	7,067,436
Vested and expected to vest, Weighted average exercise price per share (in dollars per share) | $ / shares	$ 2.74
Vested and expected to vest, weighted average contractual life remaining in years (Year)	8 years 131 days
Vested and expected to vest, aggregate intrinsic value | $	$ 3,865,800