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Note 4 - Derivative Instruments and Hedging Activities - Movement in AOCI Balance (Details) - USD ($)
 3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
AOCI balance $ 155,560  
AOCI balance (56,406)  
AOCI balance 99,154  
Other comprehensive income (loss) before reclassifications 292,171  
Other comprehensive income (loss) before reclassifications (105,942)  
Other comprehensive income (loss) before reclassifications 186,229 $ 547,963
Amount reclassified from accumulated other comprehensive income (126,483)  
Amount reclassified from accumulated other comprehensive income 45,863  
Amount reclassified from accumulated other comprehensive income (80,620) $ 335,557
Other comprehensive income (loss) 165,688  
Other comprehensive income (loss) (60,079)  
Other comprehensive income (loss) 105,609  
AOCI balance 321,248  
AOCI balance (116,485)  
AOCI balance $ 204,763