Note 11 - Fair Value Accounting and Measurement - Assets Measured at Fair Value on a Nonrecurring Basis (Details) - Fair Value, Nonrecurring [Member] $ in Thousands	Dec. 31, 2022 USD ($)
Impaired loans	$ 3,034
Fair Value, Inputs, Level 1 [Member]
Impaired loans	0
Fair Value, Inputs, Level 2 [Member]
Impaired loans	0
Fair Value, Inputs, Level 3 [Member]
Impaired loans	$ 3,034