Note 6 - Interest Rate Swap Derivatives (Details)	3 Months Ended	9 Months Ended
	Sep. 30, 2015 USD ($)	Sep. 30, 2015 USD ($)	Dec. 31, 2014	Sep. 30, 2014 USD ($)
Note 6 - Interest Rate Swap Derivatives (Details) [Line Items]
Derivative, Number of Instruments Held			0	0
Derivative, Notional Amount	$ 53,000,000	$ 53,000,000		$ 30,700,000
Derivative Instruments, Gain (Loss) Recognized in Income, Ineffective Portion and Amount Excluded from Effectiveness Testing, Net	$ 0
Derivative Instruments, Gain (Loss) Reclassification from Accumulated OCI to Income, Estimated Net Amount to be Transferred		$ 1,460,000
Interest Rate Swap [Member]
Note 6 - Interest Rate Swap Derivatives (Details) [Line Items]
Derivative, Number of Instruments Held	3	3
Derivative, Notional Amount	$ 250,000,000	$ 250,000,000
Derivative Instruments, Gain (Loss) Reclassification from Accumulated OCI to Income, Estimate of Time to Transfer		12 months