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Note 11 - Fair Value Measurements (Details) - Assets Measured at Fair Value Based on Significant Unobservable Inputs - USD ($)
$ in Thousands
 6 Months Ended 12 Months Ended
Jun. 30, 2015
Dec. 31, 2014
Assets:    
Beginning balance, assets $ 365 $ 219
Ending balance, assets 384 365
Liabilities:    
Beginning balance, liabilities (250) 0
Realized gain (loss) included in earnings - net derivatives 235 (250)
Principal redemption 0  
Ending balance, liabilities (15) (250)
Assets:    
Realized and unrealized gain (loss) included in earnings - net derivatives 19 146
Principal redemption 0  
Equity Investment Other [Member]    
Assets:    
Beginning balance, assets 219 219
Ending balance, assets 219 219
Assets:    
Realized and unrealized gain (loss) included in earnings - net derivatives 0 0
Principal redemption 0  
Derivative Assets and Liabilities [Member]    
Assets:    
Beginning balance, assets 146 0
Ending balance, assets 165 146
Liabilities:    
Beginning balance, liabilities (250) 0
Realized gain (loss) included in earnings - net derivatives 235 (250)
Principal redemption 0  
Ending balance, liabilities (15) (250)
Assets:    
Realized and unrealized gain (loss) included in earnings - net derivatives 19 $ 146
Principal redemption $ 0