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Note 7 - Derivative Instruments and Hedging Activities - Movement in AOCI Balance (Details) - USD ($)
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
AOCI balance, Gains and losses on cash flow hedges $ 155,560 $ (1,721,683) $ (946,676)
Other comprehensive income (loss) before reclassifications, Gains and losses on cash flow hedges 863,425 871,925 (3,171,740)
Amount reclassified from accumulated other comprehensive income, Gains and losses on cash flow hedges (1,018,985) 1,005,318 2,396,733
Other comprehensive income (loss), Gains and losses on cash flow hedges (155,560) 1,877,243 (775,007)
AOCI balance, Gains and losses on cash flow hedges 155,560 (1,721,683)
AOCI balance, Tax impact (56,406) 612,231 324,235
Other comprehensive income (loss) before reclassifications, Tax impact (313,078) (304,109) 1,140,275
Amount reclassified from accumulated other comprehensive income, Tax impact 369,484 (364,528) (852,279)
Other comprehensive income (loss), Tax impact 56,406 (668,637) 287,996
AOCI balance, Tax impact (56,406) 612,231
AOCI balance 99,154 (1,109,452) (622,441)
Other comprehensive income (loss) before reclassifications 550,347 567,816 (2,031,465)
Amount reclassified from accumulated other comprehensive income (649,501) 640,790 1,544,454
Other comprehensive income (loss) (99,154) 1,208,606 (487,011)
AOCI balance $ 99,154 $ (1,109,452)