Note 1 - Summary of Significant Accounting Policies (Details Textual)	12 Months Ended
	Dec. 31, 2016 USD ($)	Dec. 31, 2015 USD ($)	Dec. 31, 2014 USD ($)
Period Look-back, Quarters	12
Period Look-back, Extended, Quarters	24
Goodwill, Impairment Loss	$ 0
Unrecognized Tax Benefits	40,000	$ 40,000	$ 40,000
Unrecognized Tax Benefits, Income Tax Penalties and Interest Accrued	$ 2,000	$ 2,000
Aggregate Number of Full Service Branche Locations	37
Number of Operating Segments	2
Fair Value Hedging [Member]
Derivative, Number of Instruments Held	0	0
Minimum [Member]
Property, Plant and Equipment, Useful Life	3 years
Maximum [Member]
Property, Plant and Equipment, Useful Life	40 years