Note 3 - Basis of Presentation and Summary of Significant Accounting Policies (Details Textual) - $ / shares	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Earnings Per Share, Basic (in dollars per share)	$ 1.14	$ 1.34	$ 3.74	$ 3.52
Earnings Per Share, Diluted (in dollars per share)	$ 1.13	1.33	$ 3.73	$ 3.5
Revision of Prior Period, Error Correction, Adjustment [Member]
Earnings Per Share, Basic (in dollars per share)		0.01
Earnings Per Share, Diluted (in dollars per share)		$ 0.02