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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%

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