Note 5 - Mortgage Loan Servicing - Activity for Capitalized Mortgage Loan Servicing Rights (Details) - USD ($)	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Balance at beginning of year	$ 8,189,000	$ 4,652,000
Additions	7,711,000	6,467,000
Amortized to expense	(3,652,000)	(2,930,000)
Balance at end of year	$ 12,248,000	$ 8,189,000