Note 11 - Fair Value Measurements (Details) - Assets Measured at Fair Value Based on Significant Unobservable Inputs - USD ($) $ in Thousands	9 Months Ended	12 Months Ended
	Sep. 30, 2015	Dec. 31, 2014
Assets:
Beginning balance, assets	$ 365	$ 219
Ending balance, assets	416	365
Liabilities:
Beginning balance, liabilities	250	0
Realized gain (loss) included in earnings - net derivatives	(5)	250
Ending balance, liabilities	245	250
Assets:
Realized and unrealized gain (loss) included in earnings - net derivatives	51	146
Equity Investment Other [Member]
Assets:
Beginning balance, assets	219	219
Ending balance, assets	219	219
Liabilities:
Beginning balance, liabilities	0	0
Realized gain (loss) included in earnings - net derivatives	0	0
Ending balance, liabilities	0	0
Assets:
Realized and unrealized gain (loss) included in earnings - net derivatives	0	0
Derivative Assets and Liabilities [Member]
Assets:
Beginning balance, assets	146	0
Ending balance, assets	197	146
Liabilities:
Beginning balance, liabilities	250	0
Realized gain (loss) included in earnings - net derivatives	(5)	250
Ending balance, liabilities	245	250
Assets:
Realized and unrealized gain (loss) included in earnings - net derivatives	$ 51	$ 146