Note 2 - Securities - Debt Securities by Maturity (Details) - USD ($)	Mar. 31, 2023	Dec. 31, 2022
Due in 2023, Weighted Average Yield	0.98%
Due in 2023, Amortized Cost	$ 20,361,000
Due in 2023, Fair Value	$ 19,997,000
Due in 2024 through 2028, Weighted Average Yield	1.32%
Due in 2024 through 2028, Amortized Cost	$ 319,037,000
Due in 2024 through 2028, Fair Value	$ 293,271,000
Due in 2029 through 2033, Weighted Average Yield	2.03%
Due in 2029 through 2033, Amortized Cost	$ 278,488,000
Due in 2029 through 2033, Fair Value	$ 241,115,000
Due in 2034 and beyond, Weighted Average Yield	3.58%
Due in 2034 and beyond, Amortized Cost	$ 35,647,000
Due in 2034 and beyond, Fair Value	$ 33,500,000
Total available for sale securities, weighted average yield	1.76%
Total available for sale securities, Amortized Cost	$ 691,197,000	$ 685,646,000
Securities available for sale	$ 619,973,000	602,936,000
Collateralized Mortgage-Backed Securities [Member]
No single maturity, weighted average yield	2.12%
No single maturity, amortized cost	$ 37,164,000
No single maturity, fair value	31,590,000
Total available for sale securities, Amortized Cost	37,164,000	38,002,000
Securities available for sale	$ 31,590,000	31,953,000
Other Debt and Equity Securities [Member]
No single maturity, weighted average yield	8.00%
No single maturity, amortized cost	$ 500,000
No single maturity, fair value	500,000
Total available for sale securities, Amortized Cost	500,000	500,000
Securities available for sale	$ 500,000	$ 500,000

Amortized cost of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), with single maturity date and allocated without single maturity date, maturing in first through fifth fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).

No definition available.