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Note 5 - Derivative Financial Instruments (Details Textual) - USD ($)
9 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Dec. 31, 2014
Accumulated Other Comprehensive Income (Loss), Cumulative Changes in Net Gain (Loss) from Cash Flow Hedges, Effect Net of Tax $ 0   $ (101,000)
Price Risk Cash Flow Hedge Gain (Loss) Reclassified to Earnings, Net $ 107,000 $ 15,000