Note 7 - Derivatives and Hedging Activities (Details Textual)	12 Months Ended
	Dec. 31, 2016 USD ($)	Dec. 31, 2015 USD ($)	Dec. 31, 2014 USD ($)
Payments for Hedge, Investing Activities			$ 2,071,650
Derivative Instruments, Gain (Loss) Recognized in Income, Ineffective Portion and Amount Excluded from Effectiveness Testing, Net	76,797	156
Interest Rate Cap [Member] | Cash Flow Hedging [Member]
Payments for Hedge, Investing Activities	$ 2,100,000	$ 2.10
Number of Interest Rate Derivatives Held	2