Note 15 - Fair Value Measurements - Level 3 Fair Value Measurements (Details) - Valuation, Market Approach [Member]		Dec. 31, 2021	[4]	Dec. 31, 2020
Measurement Input, Discount Rate [Member] | Minimum [Member]
Present value of cash flows	[1]			0.0550
OREO	[2]			0.0000
Measurement Input, Discount Rate [Member] | Maximum [Member]
Present value of cash flows	[1]			0.0650
OREO	[2]			0.0766
Measurement Input, Discount Rate [Member] | Weighted Average [Member]
OREO	[2]			0.0062
Measurement Input, Cost to Sell [Member] | Minimum [Member]
OREO	[3]			0.0400
Measurement Input, Cost to Sell [Member] | Maximum [Member]
OREO	[3]			0.0923
Measurement Input, Cost to Sell [Member] | Weighted Average [Member]
OREO		0.0620		0.0454	[3]

[1] Unobservable inputs were weighted by the relative fair value of the impaired loans.

[2] Discounts were weighted by the relative appraised value of the OREO properties.

[3] The appraised value is discounted by selling costs if the OREO property is listed with a realtor and if appraised value exceeds the list price, less estimated selling costs. Selling costs do not discount appraised value if the Company markets the OREO property independently or if the OREO property is listed with a realtor and the list price less estimated selling costs exceeds appraised value.

[4] As of December 31, 2021, the Company held one OREO property