Note 8 - Derivative Financial Instruments - Derivative Position Designated As a Cash Flow Hedge (Details) - Designated as Hedging Instrument [Member] - Cash Flow Hedging [Member] - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2016	Dec. 31, 2015	Dec. 31, 2013
Interest Rate Swap, Maturing December 6, 2016 [Member]
Notional amount	$ 10,000		$ 10,000
Receive (variable index)	US 3 Month LIBOR
Pay fixed swap rate	0.72%
Fair value	$ 2	$ 8
Interest Rate Swap, Maturing December 6, 2020 [Member]
Notional amount	$ 20,000	20,000
Receive (variable index)	US 3 Month LIBOR
Pay fixed swap rate	1.79%
Fair value	$ (558)	(101)
Notional amount	$ 30,000
Pay fixed swap rate	1.43%
Fair value	$ (556)	$ (93)