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Note 6 - Interest Rate Swap Derivatives - Pre-tax Net Gains (Losses) (Details) - USD ($)
9 Months Ended 12 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Dec. 31, 2015
Interest Rate Swap 1 [Member]      
Amount of pre-tax gain (loss) recognized in OCI $ (1,877,000)   $ (368,000)
Effective portion reclassified from AOCI into income (429,000)  
Ineffective portion recognized in income on derivatives  
Interest Rate Swap 2 [Member]      
Amount of pre-tax gain (loss) recognized in OCI (3,901,000)   (665,000)
Effective portion reclassified from AOCI into income (581,000)  
Ineffective portion recognized in income on derivatives  
Interest Rate Swap 3 [Member]      
Amount of pre-tax gain (loss) recognized in OCI (3,252,000)   (384,000)
Effective portion reclassified from AOCI into income (508,000)  
Ineffective portion recognized in income on derivatives  
Amount of pre-tax gain (loss) recognized in OCI (9,030,000)   (1,417,000)
Effective portion reclassified from AOCI into income (1,518,000)  
Ineffective portion recognized in income on derivatives $ 0