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Note 1 - Summary of Significant Accounting Policies - Estimated Useful Lives of Premises and Equipment (Details)	12 Months Ended
	Dec. 31, 2017
Building [Member] \| Minimum [Member]
Premises and equipment, useful life (Year)	5 years
Building [Member] \| Maximum [Member]
Premises and equipment, useful life (Year)	50 years
Furniture and Fixtures [Member] \| Minimum [Member]
Premises and equipment, useful life (Year)	5 years
Furniture and Fixtures [Member] \| Maximum [Member]
Premises and equipment, useful life (Year)	39 years