Note 14 - Stock Based Compensation - Stock Option Activity (Details)	12 Months Ended
	Dec. 31, 2020 USD ($) $ / shares shares
Outstanding, shares (in shares) | shares	4,308,383
Outstanding, weighted average exercise price per share (in dollars per share) | $ / shares	$ 3.44
Granted, shares (in shares) | shares	3,140,000
Granted, weighted average exercise price per share (in dollars per share) | $ / shares	$ 1.79
Exercised, shares (in shares) | shares	(225,000)
Exercised, weighted average exercise price per share (in dollars per share) | $ / shares	$ 2.40
Exercised, aggregate intrinsic value | $	$ 297,250
Forfeited, shares (in shares) | shares	(155,947)
Forfeited, weighted average exercise price per share (in dollars per share) | $ / shares	$ 3.31
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 219 days
Outstanding, aggregate intrinsic value | $	$ 0
Exercisable, shares (in shares) | shares	4,714,429
Exercisable, Weighted average exercise price per share (in dollars per share) | $ / shares	$ 3.16
Exercisable, weighted average contractual life remaining in years (Year)	8 years 94 days
Exercisable, aggregate intrinsic value | $	$ 0
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 219 days
Vested and expected to vest, aggregate intrinsic value | $	$ 0