Note 11 - Fair Value Measurements (Details Textual) - USD ($)	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015
Liabilities, Fair Value Disclosure, Nonrecurring	$ 0	$ 0
Minimum [Member]
Federal Funds Maturity	1 day
Maximum [Member]
Federal Funds Maturity	3 days