Note 16 - Income Taxes (Tables)

12 Months Ended

Dec. 31, 2014

Income Tax Disclosure [Abstract]

Schedule of Components of Income Tax Expense (Benefit) [Table Text Block]

	Years ended December 31,
	2014			2013			2012
Income (loss) before income taxes
Domestic	$	63,231,721		$	33,060,976		$	26,170,313
Foreign		(1,726,700	)		(581,445	)		(6,642,892	)
	$	61,505,021		$	32,479,531		$	19,527,421

	Years ended December 31,
	2014			2013			2012
Provision for (benefit from) income taxes:
Current provision:
Federal	$	18,301,334		$	8,024,303		$	7,594,287
State		3,894,577			1,580,963			885,958
Foreign		192,268			94,136			(188,650	)
		22,388,179			9,699,402			8,291,595
Deferred provision:
Federal		1,153,024			2,374,850			776,486
State		121,376			114,546			602,447
Foreign		(477,037	)		(283,788	)		(1,900,567	)
		797,363			2,205,608			(521,634	)
Total provision	$	23,185,542		$	11,905,010		$	7,769,961

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

	December 31,
	2014		2013
Deferred tax assets:
Net operating loss carry forward, foreign	$	2,292,023	$	2,578,640
Stock-based compensation expense		755,044		1,358,554
Accrued expenses and other		856,871		649,402
Inventory reserve		333,842		283,996
Deferred revenue		23,854		852,207
Tax credit carry forward		45,621		19,967
Deferred tas assets	$	4,307,255	$	5,742,766

	December 31,
	2014			2013
Deferred tax liabilities:
Acquisition-related Intangibles	$	(4,826,937	)	$	(6,056,162	)
Depreciation		(7,221,440	)		(6,964,428	)
Deferred tax liabilities	$	(12,048,377	)	$	(13,020,590	)

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

	Years ended December 31,
	2014			2013			2012
Statutory federal income tax rate		35.0	%		35.0	%		35.0	%
State tax expense, net of federal benefit		4.9	%		4.8	%		6.4	%
Permanent items, including nondeductible expenses		0.1	%		(0.2	%)		0.9	%
State investment tax credit		(0.1	%)		(0.1	%)		(0.2	%)
Federal, state and foreign research and development credits		(0.7	%)		(0.5	%)		(1.2	%)
Foreign rate differential		0.2	%		0.1	%		2.5	%
Domestic production deduction		(1.7	%)		(2.4	%)		(3.6	%)
Effective income tax rate		37.7	%		36.7	%		39.8	%

Summary of Income Tax Contingencies [Table Text Block]

	Years ended December 31,
	2014		2013			2012
Unrecognized tax benefit, beginning of year	$	-	$	56,170		$	56,170
Tax positions related to current year		-		-			-
Tax positions related to prior years		-		-			38,329
Statute expirations		-		(56,170	)		(38,329	)
Unrecognized tax benefit, end of year	$	-	$	-		$	56,170