Note 7 - Fair Value Measurement (Details) - USD ($)	3 Months Ended
	Mar. 31, 2016	Dec. 31, 2015
Note 7 - Fair Value Measurement (Details) [Line Items]
Liabilities, Fair Value Disclosure, Nonrecurring	$ 0	$ 0
Minimum [Member]
Note 7 - Fair Value Measurement (Details) [Line Items]
Federal Funds, Maturity	1 day
Maximum [Member]
Note 7 - Fair Value Measurement (Details) [Line Items]
Federal Funds, Maturity	3 days