Note 15 - Shareholders' Equity and Regulatory Matters - (Details Textual) - USD ($)	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018	Oct. 22, 2020	Dec. 13, 2018
Common Stock, Dividends, Per Share, Cash Paid (in dollars per share)	$ 0.46	$ 0.40
Stock Repurchased and Retired During Period, Value	$ 10,923,000	$ 5,799,000	$ 2,553,000
The 2018 Stock Repurchase Program [Member]
Stock Repurchase Program, Authorized Amount						$ 15,000,000.0
Stock Repurchased and Retired During Period, Value		5,000,000.0	$ 2,500,000	$ 0
The 2020 Stock Repurchase Program [Member]
Stock Repurchase Program, Authorized Amount					$ 30,000,000.0
Stock Repurchased and Retired During Period, Value	$ 10,900,000	$ 798,000