Note 16 - Fair Value Measurements - Quantitative Information About Level 3 Fair Value Measurements (Details) - Fair Value, Inputs, Level 3 [Member] - Measurement Input, Discount Rate [Member]	Jun. 30, 2020	[1]
Valuation Technique, Discounted Appraisal Value [Member]
Impaired loans	0.0800
Other real estate owned, net	0.0800
Valuation Technique, Discounted Cash Flow [Member]
Impaired loans	0.0512
Valuation Technique, Discounted Cash Flow [Member] | Minimum [Member]
Impaired loans	0.0350
Valuation Technique, Discounted Cash Flow [Member] | Maximum [Member]
Impaired loans	0.0980

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