Note 15 - Subsequent Events (Details Textual) - $ / shares									3 Months Ended		9 Months Ended
	Dec. 14, 2022	Oct. 13, 2022	Sep. 14, 2022	Jul. 14, 2022	Jun. 15, 2022	Apr. 14, 2022	Mar. 16, 2022	Jan. 13, 2022	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Common Stock, Dividends, Per Share, Declared (in dollars per share)				$ 0.32		$ 0.31		$ 0.31
Common Stock, Dividends, Per Share, Cash Paid (in dollars per share)			$ 0.32		$ 0.31		$ 0.31		$ 0.32	$ 0.30	$ 0.94	$ 0.88
Forecast [Member]
Common Stock, Dividends, Per Share, Cash Paid (in dollars per share)	$ 0.32
Subsequent Event [Member]
Common Stock, Dividends, Per Share, Declared (in dollars per share)		$ 0.32