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Note 10 - Income Taxes (Tables)

12 Months Ended

Dec. 31, 2015

Income Tax Disclosure [Abstract]

Schedule of Effective Income Tax Rate Reconciliation [Table Text Block]

		Year ended December 31, 2015				Year ended December 31, 2014				Year ended December 31, 2013
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

Schedule of Deferred Tax Assets and Liabilities [Table Text Block]

		December 31, 2015				December 31, 2014
Deferred tax assets:
Deferred revenue		$	5,454,284			$	5,294,767
Foreign tax credit			1,529,075				3,200,961
Amortization			(883,466	)			(414,345	)
Accruals, including foreign exchange and other			1,521,199				(702,764	)
Deferred tax assets		$	7,621,092			$	7,378,619
Deferred income tax asset, current portion		$	3,243,718			$	2,498,196
Deferred income tax asset, long-term portion			4,377,374				4,880,423
		$	7,621,092			$	7,378,619
Deferred tax liabilities:
Limited life intangible assets		$	(169,731	)		$	(208,620	)
Indefinite life intangible assets			(4,706,960	)			(4,578,731	)
Total deferred tax liability, long-term portion		$	(4,876,691	)		$	(4,787,351	)

Schedule of Unrecognized Tax Benefits Roll Forward [Table Text Block]

Total Gross Unrecognized Tax Benefits		December 31, 2015				December 31, 2014
Balance, beginning of year		$	117,000			$	117,000
Change in uncertain tax benefits			—				—
Balance, end of year		$	117,000			$	117,000

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No definition available.

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- Definition

Tabular disclosure of the components of net deferred tax asset or liability recognized in an entity's statement of financial position, including the following: the total of all deferred tax liabilities, the total of all deferred tax assets, the total valuation allowance recognized for deferred tax assets.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 50
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32537-109319

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- Definition

Tabular disclosure of the reconciliation using percentage or dollar amounts of the reported amount of income tax expense attributable to continuing operations for the year to the amount of income tax expense that would result from applying domestic federal statutory tax rates to pretax income from continuing operations.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 50
-Paragraph 12
-URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32687-109319

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Tabular disclosure of the change in unrecognized tax benefits.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 55
-Paragraph 217
-URI http://asc.fasb.org/extlink&oid=51663037&loc=d3e36027-109320

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-Name Accounting Standards Codification
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-URI http://asc.fasb.org/extlink&oid=6907707&loc=SL6600010-109319

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