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Note 11 - Fair Values - Assets and Liabilities Measured at Fair Value on a Nonrecurring Basis (Details) - Fair Value, Measurements, Nonrecurring [Member] - USD ($)	Mar. 31, 2018	Dec. 31, 2017
Impaired loans	$ 4,498,000	$ 5,836,000
Foreclosed assets	2,384,000	2,260,000
Total	6,882,000	8,096,000
Fair Value, Inputs, Level 1 [Member]
Impaired loans	0	0
Foreclosed assets	0	0
Total	0	0
Fair Value, Inputs, Level 2 [Member]
Impaired loans	0	0
Foreclosed assets	0	0
Total	0	0
Fair Value, Inputs, Level 3 [Member]
Impaired loans	4,498,000	5,836,000
Foreclosed assets	2,384,000	2,260,000
Total	$ 6,882,000	$ 8,096,000