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Note 1 - Summary of Significant Accounting Policies - Estimated Useful Lives and Methods of Depreciation (Details)	9 Months Ended
	Sep. 30, 2019
Banking Premises [Member] \| Minimum [Member]
Property, plant and equipment, useful life (Year)	15 years
Banking Premises [Member] \| Maximum [Member]
Property, plant and equipment, useful life (Year)	40 years
Furniture and Equipment [Member] \| Minimum [Member]
Property, plant and equipment, useful life (Year)	5 years
Furniture and Equipment [Member] \| Maximum [Member]
Property, plant and equipment, useful life (Year)	10 years