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Income Taxes (Details) - USD ($)
 3 Months Ended 12 Months Ended
Mar. 31, 2019
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2019
Mar. 31, 2018
Mar. 31, 2017
Income Taxes [Abstract]                      
Non-cash tax charge for deferred tax assets and liabilities                 $ 102,000 $ 2,709,000  
Provisional transition tax                 50,000 530,000  
Current tax expense [Abstract]                      
Federal                 680,000 12,187,000 $ 10,085,000
State                 647,000 1,425,000 395,000
Foreign                 1,723,000 1,194,000 1,455,000
Total current tax expense                 3,050,000 14,806,000 11,935,000
Deferred tax (benefit) expense [Abstract]                      
Federal                 (2,087,000) 949,000 4,261,000
State                 (295,000) 393,000 2,174,000
Foreign                 (400,000) (23,000) (384,000)
Total deferred tax (benefit) expense                 (2,782,000) 1,319,000 6,051,000
Total income tax expense $ 1,569,000 $ (1,035,000) $ 1,181,000 $ (1,447,000) $ 1,099,000 $ 6,994,000 $ 3,598,000 $ 4,434,000 268,000 16,125,000 $ 17,986,000
Assets [Abstract]                      
Allowance for bad debts 1,005,000       1,044,000       1,005,000 1,044,000  
Customer allowances earned 3,177,000       2,871,000       3,177,000 2,871,000  
Allowance for stock adjustment returns 2,073,000       2,038,000       2,073,000 2,038,000  
Inventory obsolescence reserve 3,701,000       1,666,000       3,701,000 1,666,000  
Stock options 2,221,000       1,728,000       2,221,000 1,728,000  
Estimate for returns 2,107,000       876,000       2,107,000 876,000  
Accrued compensation 1,578,000       1,152,000       1,578,000 1,152,000  
Net operating losses 2,088,000       1,079,000       2,088,000 1,079,000  
Tax credits 1,495,000       1,363,000       1,495,000 1,363,000  
Other 5,776,000       2,091,000       5,776,000 2,091,000  
Total deferred tax assets 25,221,000       15,908,000       25,221,000 15,908,000  
Liabilities [Abstract]                      
Plant and equipment, net (3,316,000)       (1,025,000)       (3,316,000) (1,025,000)  
Intangibles, net (5,390,000)       (3,560,000)       (5,390,000) (3,560,000)  
Other (3,278,000)       (3,072,000)       (3,278,000) (3,072,000)  
Total deferred tax liabilities (11,984,000)       (7,657,000)       (11,984,000) (7,657,000)  
Less valuation allowance (3,748,000)       (1,779,000)       (3,748,000) (1,779,000)  
Net deferred tax assets 9,489,000       6,472,000       9,489,000 6,472,000  
Net long-term deferred income tax liability (257,000)       (226,000)       (257,000) (226,000)  
Net long-term deferred income tax asset 9,746,000       $ 6,698,000       9,746,000 $ 6,698,000  
State net operating loss carryforwards $ 1,472,000               $ 1,472,000    
Difference between income tax expense at the federal statutory rate and effective tax rate [Abstract]                      
Statutory federal income tax rate                 21.00% 31.50% 35.00%
State income tax rate, net of federal benefit                 (3.70%) 3.60% 2.30%
Excess tax benefit from stock compensation                 0.70% (0.70%) (1.40%)
Foreign income taxed at different rates                 0.00% (2.60%) (0.70%)
Warrants                 0.00% (2.10%) (2.40%)
Non-deductible executive compensation                 (7.30%) 1.00% 0.80%
Change in valuation allowance                 (15.30%) 4.80% 0.00%
Effects of mandatory redeemed repatriation                 0.00% 1.50% 0.00%
Effects of U.S. tax rate changes                 0.30% 8.00% 0.00%
Uncertain tax positions                 1.80% 0.60% (0.20%)
Research and development credit                 1.30% (0.20%) 0.00%
Non-deductible transaction costs                 (2.10%) 0.00% 0.00%
Other income tax                 (0.20%) 0.20% (1.70%)
Effective tax rate                 (3.50%) 45.60% 31.70%