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Note 7 - Derivative Instruments and Hedging Activities - Movement in AOCI Balance (Details) - USD ($)
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
AOCI balance $ (1,721,683) $ (946,676) $ (372,593)
AOCI balance 612,231 324,235 127,612
AOCI balance (1,109,452) (622,441) (244,981)
Other comprehensive income (loss) before reclassifications 871,925 (3,171,740) (1,527,171)
Other comprehensive income (loss) before reclassifications (304,109) 1,140,275 523,056
Other comprehensive income (loss) before reclassifications 567,816 (2,031,465) (1,004,115)
Amount reclassified from accumulated other comprehensive income 1,005,318 2,396,733 953,088
Amount reclassified from accumulated other comprehensive income (364,528) (852,279) (326,433)
Amount reclassified from accumulated other comprehensive income 640,790 1,544,454 626,655
Other comprehensive income (loss) 1,877,243 (775,007) (574,083)
Other comprehensive income (loss) (668,637) 287,996 196,623
Other comprehensive income (loss) 1,208,606 (487,011) (377,460)
AOCI balance 155,560 (1,721,683) (946,676)
AOCI balance (56,406) 612,231 324,235
AOCI balance $ 99,154 $ (1,109,452) $ (622,441)