Note 7 - Derivative Financial Instruments (Details Textual) - Cash Flow Hedging [Member] - Designated as Hedging Instrument [Member] - USD ($) $ in Thousands	Jun. 30, 2016	Dec. 31, 2015	Dec. 31, 2013
Interest Rate Swap, Maturing December 6, 2016 [Member]
Derivative, Notional Amount	$ 10,000		$ 10,000
Interest Rate Swap, Maturing December 6, 2020 [Member]
Derivative, Notional Amount	20,000	$ 20,000
Derivative, Notional Amount	$ 30,000

Aggregate notional amount specified by the derivative(s). Expressed as an absolute value.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Article 12
-Section 13
-Sentence Column B

Name:	invest_DerivativeNotionalAmount
Namespace Prefix:	invest_
Data Type:	xbrli:monetaryItemType
Balance Type:	na
Period Type:	instant