Note 11 - Fair Values - Assets and Liabilities Measured at Fair Value on a Nonrecurring Basis (Details) - Fair Value, Measurements, Nonrecurring [Member] - USD ($)	Jun. 30, 2017	Dec. 31, 2016
Total	$ 7,433,000	$ 10,365,000
Impaired loans	6,644,000	9,896,000
Foreclosed assets	789,000	469,000
Fair Value, Inputs, Level 1 [Member]
Total	0	0
Impaired loans	0	0
Foreclosed assets	0	0
Fair Value, Inputs, Level 2 [Member]
Total	0	0
Impaired loans	0	0
Foreclosed assets	0	0
Fair Value, Inputs, Level 3 [Member]
Total	7,433,000	10,365,000
Impaired loans	6,644,000	9,896,000
Foreclosed assets	$ 789,000	$ 469,000