Note 1 - Summary of Significant Accounting Policies - Premises and Equipment Estimated Useful Lives (Details) |
12 Months Ended |
|---|---|
Dec. 31, 2016 | |
| Building and Building Improvements [Member] | Minimum [Member] | |
| Property, Plant and Equipment, Useful Life (Year) | 10 years |
| Building and Building Improvements [Member] | Maximum [Member] | |
| Property, Plant and Equipment, Useful Life (Year) | 40 years |
| Furniture and Fixtures [Member] | Minimum [Member] | |
| Property, Plant and Equipment, Useful Life (Year) | 5 years |
| Furniture and Fixtures [Member] | Maximum [Member] | |
| Property, Plant and Equipment, Useful Life (Year) | 10 years |
| Leasehold Improvements [Member] | |
| Property, Plant and Equipment, Useful Life (Year) | 18 years |
| Computer Equipment [Member] | Minimum [Member] | |
| Property, Plant and Equipment, Useful Life (Year) | 3 years |
| Computer Equipment [Member] | Maximum [Member] | |
| Property, Plant and Equipment, Useful Life (Year) | 5 years |