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Note 10 - Income Taxes (Details) - Provision for Income Taxes Differs from the Amount Computed by Applying the Statutory Federal Income Tax Rate - USD ($)	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Provision for Income Taxes Differs from the Amount Computed by Applying the Statutory Federal Income Tax Rate [Abstract]
Income for the year before provision for income taxes	$ 17,942,957	$ 9,428,325	$ 5,799,803
Computed expected tax expense	6,100,605	3,205,631	1,971,933
Increase (reduction) in income tax expense resulting from:
State income taxes	265,489	64,056	14,500
Permanent differences, including foreign exchange	278,959	192,260	13,700
Investment tax credits recovered			(115,455)
Other, including alternative minimum tax and adjustments to opening deferred tax assets	(75,826)	(407,718)	(265,339)
Provision for income taxes	$ 6,569,227	$ 3,054,229	$ 1,619,339

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Represents the investment tax credits recovered.

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Sum of operating profit and nonoperating income or expense before Income or Loss from equity method investments, income taxes, extraordinary items, and noncontrolling interest.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 235
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.4-08.(h)(1)(i))
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Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 50
-Paragraph 9
-Subparagraph (a),(b)
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The amount of income tax expense or benefit for the period computed by applying the domestic federal statutory tax rates to pretax income from continuing operations.

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Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to other adjustments.

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