Note 13 - Income Taxes (Details Textual) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Income (Loss) Attributable to Parent, before Tax, Total	$ (4,000,000.0)	$ 31,600,000	$ (4,600,000)	$ 47,300,000
Income Tax Expense (Benefit), Total	$ (870,801)	$ 7,461,038	$ (805,328)	$ 11,077,854
Effective Income Tax Rate Reconciliation, Percent, Total	21.90%	23.60%	17.70%	23.40%
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent	21.00%		21.00%
Effective Income Tax Rate Reconciliation, Expiration of Stock Options, Amount			$ 200,000