Income Taxes (Details) - USD ($)	3 Months Ended								12 Months Ended
	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2017	Mar. 31, 2016	Mar. 31, 2015
Current tax expense [Abstract]
Federal									$ 9,451,000	$ 12,400,000	$ 1,523,000
State									318,000	1,995,000	1,100,000
Foreign									1,455,000	803,000	527,000
Total current tax expense									11,224,000	15,198,000	3,150,000
Deferred tax expense (benefit)
Federal									4,291,000	(2,929,000)	5,553,000
State									2,174,000	(757,000)	93,000
Foreign									(384,000)	(33,000)	272,000
Total deferred tax expense (benefit)									6,081,000	(3,719,000)	5,918,000
Total income tax expense	$ 3,846,000	$ 5,678,000	$ 4,845,000	$ 2,936,000	$ 4,658,000	$ 6,451,000	$ (898,000)	$ 1,268,000	17,305,000	11,479,000	$ 9,068,000
Assets [Abstract]
Accounts receivable valuation	4,697,000				6,438,000				4,697,000	6,438,000
Allowance for customer incentives	2,894,000				769,000				2,894,000	769,000
Inventory obsolescence reserve	1,608,000				1,431,000				1,608,000	1,431,000
Stock options	1,971,000				1,714,000				1,971,000	1,714,000
Intangibles, net	339,000				380,000				339,000	380,000
Estimate for returns	3,191,000				7,938,000				3,191,000	7,938,000
Accrued compensation	1,785,000				1,485,000				1,785,000	1,485,000
Net operating losses	834,000				2,070,000				834,000	2,070,000
Tax credits	0				1,660,000				0	1,660,000
Other	2,065,000				2,583,000				2,065,000	2,583,000
Total deferred tax assets	19,384,000				26,468,000				19,384,000	26,468,000
Liabilities [Abstract]
Property and equipment, net	(1,605,000)				(1,119,000)				(1,605,000)	(1,119,000)
Other	(4,413,000)				(6,277,000)				(4,413,000)	(6,277,000)
Total deferred tax liabilities	(6,018,000)				(7,396,000)				(6,018,000)	(7,396,000)
Less valuation allowance	0				0				0	0
Net deferred tax assets	13,366,000				19,072,000				13,366,000	19,072,000
Net long-term deferred income tax liability	(180,000)				(196,000)				(180,000)	(196,000)
Net long-term deferred income tax asset	13,546,000				$ 19,268,000				13,546,000	$ 19,268,000
State net operating loss carryforwards	$ 6,334,000								6,334,000
Excess tax benefit from early adoption of new pronouncement									$ 748,000
Difference between income tax expense at the federal statutory rate and effective tax rate [Abstract]
Statutory federal income tax rate									35.00%	35.00%	35.00%
State income tax rate, net of federal benefit									2.20%	4.00%	2.20%
Change in deferred tax rate									0.00%	0.00%	(0.20%)
Excess tax benefit from stock compensation									(1.40%)	0.00%	0.00%
Foreign income taxed at different rates									(0.70%)	(0.80%)	(0.90%)
Warrants									(2.40%)	8.20%	0.80%
Non-deductible executive compensation									0.80%	2.20%	3.40%
Uncertain Tax Positions									(0.20%)	0.40%	2.50%
Other income tax									(1.80%)	3.10%	1.40%
Effective tax rate									31.50%	52.10%	44.20%