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Note 4 - Derivative Instruments and Hedging Activities - Movement in AOCI Balance (Details) - USD ($)
 3 Months Ended 9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
AOCI balance $ (187,169)   $ (1,721,683)  
AOCI balance 67,868   612,231  
AOCI balance (119,301)   (1,109,452)  
Other comprehensive income (loss) before reclassifications (92,282)   791,269  
Other comprehensive income (loss) before reclassifications 33,461   (274,863)  
Other comprehensive income (loss) before reclassifications (58,821) $ (724,336) 516,406 $ (1,723,247)
Amount reclassified from accumulated other comprehensive income 206,953   857,916  
Amount reclassified from accumulated other comprehensive income (75,041)   (311,080)  
Amount reclassified from accumulated other comprehensive income 131,912 $ 364,330 546,836 $ 1,152,359
Other comprehensive income (loss) for the three months ended September 30, 2016 114,671   1,649,185  
Other comprehensive income (loss) for the three months ended September 30, 2016 (41,580)   (585,943)  
Other comprehensive income (loss) for the three months ended September 30, 2016 73,091   1,063,242  
AOCI balance (72,498)   (72,498)  
AOCI balance 26,288   26,288  
AOCI balance $ (46,210)   $ (46,210)