Note 8 - Per Share Data - Reconciliation of the Basic and Diluted Loss Per Share (Details) - USD ($)	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Net income	$ 33,904,806	$ 69,450,766	$ 56,342,010
Less: Change in fair value of warrants	400,663	117,770	0
Net income, adjusted for change in fair value of warrants for diluted earnings per share	$ 33,504,143	$ 69,332,996	$ 56,342,010
Weighted average shares outstanding: basic (in shares)	72,929,550	75,322,194	79,259,000
Effect of potential common shares (in shares)	616,951	1,080,522	178,306
Weighted average shares outstanding: diluted (in shares)	73,546,501	76,402,716	79,437,306
Basic earnings per share (in dollars per share)	$ 0.46	$ 0.92	$ 0.71
Diluted earnings per share (in dollars per share)	$ 0.46	$ 0.91	$ 0.71