Note 6 - Stockholders' Equity - Summary of Stock Option Activity (Details) - USD ($)	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Options outstanding (in shares)	4,697,029	5,135,685	2,467,537
Options outstanding, weighted average exercise price (in dollars per share)	$ 6.98	$ 7.1	$ 7.06
Options outstanding, weighted average remaining contractual term (Year)	3 years 29 days	4 years 1 month 6 days	5 years 1 month 2 days	6 years 11 months 26 days
Options outstanding, aggregate intrinsic value	$ 103,691,060	$ 47,607,209	$ 25,064,799	$ 29,503,551
Options granted (in shares)	0	0	2,975,000
Options granted, weighted average exercise price (in dollars per share)	$ 0	$ 0	$ 7
Options exercised (in shares)	(151,813)	(246,156)	(142,409)
Options exercised, weighted average exercise price (in dollars per share)	$ 6.02	$ 6.08	$ 4.1
Options forfeited (in shares)	(75,000)	(192,500)	(164,443)
Options forfeited, weighted average exercise price (in dollars per share)	$ 13.25	$ 11.3	$ 7.84
Options expired (in shares)	0	0	0
Options expired, weighted average exercise price (in dollars per share)	$ 0	$ 0	$ 0
Options expired, weighted average exercise price (in dollars per share)	$ 0	$ 0	$ 0
Options outstanding (in shares)	4,470,216	4,697,029	5,135,685	2,467,537
Options outstanding, weighted average exercise price (in dollars per share)	$ 6.9	$ 6.98	$ 7.1	$ 7.06
Options exercisable (in shares)	3,147,293
Options exercisable, weighted average exercise price (in dollars per share)	$ 6.77
Options exercisable, weighted average remaining contractual term (Year)	3 years 3 months 14 days
Options exercisable, aggregate intrinsic value	$ 73,417,302