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Income Taxes (Details) - USD ($)
 3 Months Ended 9 Months Ended 12 Months Ended
Mar. 31, 2018
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2016
Sep. 30, 2016
Jun. 30, 2016
Dec. 31, 2017
Mar. 31, 2018
Mar. 31, 2017
Mar. 31, 2016
Income Taxes [Abstract]                        
One-time non-cash tax charge for deferred income taxes                   $ 4,863,000    
Estimated accrued toll charge liability $ 530,000                 530,000    
Current tax expense [Abstract]                        
Federal                   12,153,000 $ 9,451,000 $ 12,400,000
State                   1,406,000 318,000 1,995,000
Foreign                   1,215,000 1,455,000 803,000
Total current tax expense                   14,774,000 11,224,000 15,198,000
Deferred tax expense (benefit) [Abstract]                        
Federal                   2,779,000 4,291,000 (2,929,000)
State                   333,000 2,174,000 (757,000)
Foreign                   (23,000) (384,000) (33,000)
Total deferred tax expense (benefit)                   3,089,000 6,081,000 (3,719,000)
Total income tax expense 1,764,000 $ 7,756,000 $ 4,027,000 $ 4,316,000 $ 3,846,000 $ 5,678,000 $ 4,845,000 $ 2,936,000   17,863,000 17,305,000 $ 11,479,000
Assets [Abstract]                        
Accounts receivable valuation 3,915,000       4,697,000         3,915,000 4,697,000  
Allowance for customer incentives 2,038,000       2,894,000         2,038,000 2,894,000  
Inventory obsolescence reserve 1,666,000       1,608,000         1,666,000 1,608,000  
Stock options 1,728,000       1,971,000         1,728,000 1,971,000  
Intangibles, net 59,000       339,000         59,000 339,000  
Estimate for returns 1,115,000       3,191,000         1,115,000 3,191,000  
Accrued compensation 1,152,000       1,785,000         1,152,000 1,785,000  
Net operating losses 1,079,000       834,000         1,079,000 834,000  
Tax credits 1,363,000       0         1,363,000 0  
Other 2,091,000       2,065,000         2,091,000 2,065,000  
Total deferred tax assets 16,206,000       19,384,000         16,206,000 19,384,000  
Liabilities [Abstract]                        
Property and equipment, net (1,025,000)       (1,605,000)         (1,025,000) (1,605,000)  
Other (3,072,000)       (4,413,000)         (3,072,000) (4,413,000)  
Total deferred tax liabilities (4,097,000)       (6,018,000)         (4,097,000) (6,018,000)  
Less valuation allowance (1,779,000)       0         (1,779,000) 0  
Net deferred tax assets 10,330,000       13,366,000         10,330,000 13,366,000  
Net long-term deferred income tax liability (226,000)       (180,000)         (226,000) (180,000)  
Net long-term deferred income tax asset 10,556,000       $ 13,546,000         10,556,000 $ 13,546,000  
State net operating loss carryforwards $ 932,000                 $ 932,000    
Difference between income tax expense at the federal statutory rate and effective tax rate [Abstract]                        
Statutory federal income tax rate 21.00%               35.00% 31.50% 35.00% 35.00%
State income tax rate, net of federal benefit                   3.30% 2.20% 4.00%
Excess tax benefit from stock compensation                   (0.70%) (1.40%) 0.00%
Foreign income taxed at different rates                   (2.60%) (0.70%) (0.80%)
Warrants                   (2.10%) (2.40%) 8.20%
Non-deductible executive compensation                   1.00% 0.80% 2.20%
Change in valuation allowance                   4.90% 0.00% 0.00%
Effects of mandatory redeemed repatriation                   1.60% 0.00% 0.00%
Effects of U.S. tax rate changes                   14.20% 0.00% 0.00%
Uncertain Tax Positions                   0.60% (0.20%) 0.40%
Other income tax                   0.60% (1.80%) 3.10%
Effective tax rate                   52.30% 31.50% 52.10%