Note 1 - Estimated Useful Lives and Methods of Depreciation (Details)	3 Months Ended
	Mar. 31, 2016
Banking Premises [Member] | Minimum [Member]
Property, plant and equipment, useful life	15 years
Banking Premises [Member] | Maximum [Member]
Property, plant and equipment, useful life	40 years
Banking Premises [Member]
Property, plant and equipment, depreciation method	Straight-Line and Accelerated
Furniture and Equipment [Member] | Minimum [Member]
Property, plant and equipment, useful life	5 years
Furniture and Equipment [Member] | Maximum [Member]
Property, plant and equipment, useful life	10 years
Furniture and Equipment [Member]
Property, plant and equipment, depreciation method	Straight-Line and Accelerated