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Note 5 - Derivative Instruments and Hedging Activities - Movement in AOCI Balance (Details) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
AOCI balance, Gains and losses on cash flow hedges	$ 517,894		$ 155,560
AOCI balance, Tax impact	(187,788)		(56,406)
AOCI balance	330,106		99,154
Other comprehensive income (loss) before reclassifications, Gains and losses on cash flow hedges	485,480		1,001,634
Other comprehensive income (loss) before reclassifications, Tax impact	(176,035)		(363,192)
Other comprehensive income (loss) before reclassifications	309,445	$ (58,821)	638,442	$ 516,406
Amount reclassified from accumulated other comprehensive income, Gains and losses on cash flow hedges	(498,142)		(651,962)
Amount reclassified from accumulated other comprehensive income, Tax impact	180,626		236,401
Amount reclassified from accumulated other comprehensive income	(317,516)	$ 131,912	(415,561)	$ 546,836
Other comprehensive income (loss), Gains and losses on cash flow hedges	(12,662)		349,672
Other comprehensive income (loss), Tax impact	4,591		(126,791)
Other comprehensive income (loss)	(8,071)		222,881
AOCI balance, Gains and losses on cash flow hedges	505,232		505,232
AOCI balance, Tax impact	(183,197)		(183,197)
AOCI balance	$ 322,035		$ 322,035

X

- Definition

Accumulated change in equity from transactions and other events and circumstances from non-owner sources, tax expense (benefit). Excludes Net Income (Loss), and accumulated changes in equity from transactions resulting from investments by owners and distributions to owners. Includes foreign currency translation items, certain pension adjustments, unrealized gains and losses on certain investments in debt and equity securities, other than temporary impairment (OTTI) losses related to factors other than credit losses on available-for-sale and held-to-maturity debt securities that an entity does not intend to sell and it is not more likely than not that the entity will be required to sell before recovery of the amortized cost basis, as well as changes in the fair value of derivatives related to the effective portion of a designated cash flow hedge.

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Amount before tax of increase (decrease) in accumulated equity from transactions and other events and circumstances from non-owner sources, including portion attributable to noncontrolling interest. Excludes net income (loss), and accumulated changes in equity from transactions resulting from investments by owners (distributions to owners).

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Accumulated change in equity from transactions and other events and circumstances from non-owner sources, net of tax effect, at period end. Excludes Net Income (Loss), and accumulated changes in equity from transactions resulting from investments by owners and distributions to owners. Includes foreign currency translation items, certain pension adjustments, unrealized gains and losses on certain investments in debt and equity securities, other than temporary impairment (OTTI) losses related to factors other than credit losses on available-for-sale and held-to-maturity debt securities that an entity does not intend to sell and it is not more likely than not that the entity will be required to sell before recovery of the amortized cost basis, as well as changes in the fair value of derivatives related to the effective portion of a designated cash flow hedge.

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Amount before tax, after reclassification adjustments, of increase (decrease) in accumulated gain (loss) from derivative instruments designated and qualifying as the effective portion of cash flow hedges and an entity's share of an equity investee's increase (decrease) in deferred hedging gain (loss).

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