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Summary of Significant Accounting Policies (Details) | 3 Months Ended | 12 Months Ended
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Mar. 31, 2016 USD ($) $ / shares | Dec. 31, 2015 USD ($) $ / shares | Sep. 30, 2015 USD ($) $ / shares | Jun. 30, 2015 USD ($) $ / shares | Mar. 31, 2015 USD ($) $ / shares | Dec. 31, 2014 USD ($) $ / shares | Sep. 30, 2014 USD ($) $ / shares | Jun. 30, 2014 USD ($) $ / shares | Mar. 31, 2016 USD ($) ReportingUnit $ / shares shares | Mar. 31, 2015 USD ($) $ / shares shares | Mar. 31, 2014 USD ($) $ / shares shares
Inventory [Abstract] |  |  |  |  |  |  |  |  |  |  |
Prior period over which allocations of labor and variable and fixed overhead costs are determined based on average actual use of production facilities |  |  |  |  |  |  |  |  | 12 months |  |
Unallocated overhead costs excluded from calculation of finished goods cost |  |  |  |  |  |  |  |  | $ 0 | $ 0 | $ 1,070,000
Reserve for excess and obsolete inventory | $ 3,626,000 |  |  |  | $ 2,675,000 |  |  |  | $ 3,626,000 | 2,675,000 |
Period of normal operating cycle |  |  |  |  |  |  |  |  | 1 year |  |
Long-term core inventory [Abstract] |  |  |  |  |  |  |  |  |  |  |
Long-term core inventory deposits transferred | 25,805,000 |  |  |  |  |  |  |  | $ 25,805,000 |  |
Remanufactured cores included in long-term core inventory deposits |  |  |  |  | 26,002,000 |  |  |  |  | 26,002,000 |
Intangible Assets [Abstract] |  |  |  |  |  |  |  |  |  |  |
Intangible assets, net of amortization | 4,573,000 |  |  |  | 2,574,000 |  |  |  | $ 4,573,000 | 2,574,000 |
Goodwill [Abstract] |  |  |  |  |  |  |  |  |  |  |
Number of reporting units | ReportingUnit |  |  |  |  |  |  |  |  | 1 |  |
Goodwill | 2,053,000 |  |  |  | 0 |  |  |  | $ 2,053,000 | 0 |
Advertising Costs [Abstract] |  |  |  |  |  |  |  |  |  |  |
Advertising expenses |  |  |  |  |  |  |  |  | 474,000 | 224,000 | 205,000
Reconciliation of basic and diluted net income (loss) per share [Abstract] |  |  |  |  |  |  |  |  |  |  |
Income from continuing operations |  |  |  |  |  |  |  |  | 10,563,000 | 11,453,000 | 6,482,000
Income from discontinued operations |  |  |  |  |  |  |  |  | 0 | 0 | 100,877,000
Net income | $ 2,297,000 | $ 7,748,000 | $ (1,392,000) | $ 1,910,000 | $ 3,102,000 | $ 2,927,000 | $ 1,475,000 | $ 3,949,000 | $ 10,563,000 | $ 11,453,000 | $ 107,359,000
Basic shares (in shares) | shares |  |  |  |  |  |  |  |  | 18,233,163 | 16,734,539 | 14,633,946
Effect of dilutive stock options and warrants (in shares) | shares |  |  |  |  |  |  |  |  | 832,930 | 871,401 | 683,985
Diluted shares (in shares) | shares |  |  |  |  |  |  |  |  | 19,066,093 | 17,605,940 | 15,317,931
Net income per share [Abstract] |  |  |  |  |  |  |  |  |  |  |
Basic net income per share from continuing operations (in dollars per share) | $ / shares |  |  |  |  |  |  |  |  | $ 0.58 | $ 0.68 | $ 0.45
Basic net income per share from discontinued operations (in dollars per share) | $ / shares |  |  |  |  |  |  |  |  | 0 | 0 | 6.89
Basic net income per share (in dollars per share) | $ / shares | $ 0.12 | $ 0.42 | $ (0.08) | $ 0.11 | $ 0.17 | $ 0.16 | $ 0.09 | $ 0.26 | 0.58 | 0.68 | 7.34
Diluted net income per share from continuing operations (in dollars per share) | $ / shares |  |  |  |  |  |  |  |  | 0.55 | 0.65 | 0.42
Diluted net income per share from discontinued operations (in dollars per share) | $ / shares |  |  |  |  |  |  |  |  | 0 | 0 | 6.59
Diluted net income per share (in dollars per share) | $ / shares | $ 0.12 | $ 0.41 | $ (0.08) | $ 0.10 | $ 0.16 | $ 0.16 | $ 0.09 | $ 0.25 | $ 0.55 | $ 0.65 | $ 7.01
Black-Scholes option pricing model assumptions used to derive the weighted average fair value of the stock options granted [Abstract] |  |  |  |  |  |  |  |  |  |  |
Weighted average risk free interest rate |  |  |  |  |  |  |  |  | 1.73% | 1.75% | 1.88%
Weighted average expected holding period |  |  |  |  |  |  |  |  | 5 years 9 months 4 days | 5 years 4 days | 5 years 10 months 20 days
Weighted average expected volatility |  |  |  |  |  |  |  |  | 46.84% | 46.02% | 48.15%
Weighted average expected dividend yield |  |  |  |  |  |  |  |  | 0.00% | 0.00% | 0.00%
Weighted average fair value of options granted (in dollars per share) | $ / shares |  |  |  |  |  |  |  |  | $ 14.14 | $ 9.65 | $ 5.16
Deferred Compensation Plan [Abstract] |  |  |  |  |  |  |  |  |  |  |
Short-term investments redeemed for the payment of deferred compensation liabilities |  |  |  |  |  |  |  |  | $ 0 | $ 4,000 |
Carrying value of plan assets | $ 1,813,000 |  |  |  | $ 699,000 |  |  |  | 1,813,000 | 699,000 |
Deferred compensation obligation | $ 1,813,000 |  |  |  | 699,000 |  |  |  | 1,813,000 | 699,000 |
Expense related to the deferred compensation plan |  |  |  |  |  |  |  |  | $ 409,000 | 17,000 | $ 10,000
Maximum [Member] |  |  |  |  |  |  |  |  |  |  |
Inventory [Abstract] |  |  |  |  |  |  |  |  |  |  |
Percentage of inventory reserve to cost if no liquidation market exists for part | 100.00% |  |  |  |  |  |  |  | 100.00% |  |
Machinery and Equipment [Member] | Minimum [Member] |  |  |  |  |  |  |  |  |  |  |
Plant and Equipment [Line Items] |  |  |  |  |  |  |  |  |  |  |
Estimated service life |  |  |  |  |  |  |  |  | 5 years |  |
Machinery and Equipment [Member] | Maximum [Member] |  |  |  |  |  |  |  |  |  |  |
Plant and Equipment [Line Items] |  |  |  |  |  |  |  |  |  |  |
Estimated service life |  |  |  |  |  |  |  |  | 10 years |  |
Office Equipment and Fixtures [Member] | Minimum [Member] |  |  |  |  |  |  |  |  |  |  |
Plant and Equipment [Line Items] |  |  |  |  |  |  |  |  |  |  |
Estimated service life |  |  |  |  |  |  |  |  | 3 years |  |
Office Equipment and Fixtures [Member] | Maximum [Member] |  |  |  |  |  |  |  |  |  |  |
Plant and Equipment [Line Items] |  |  |  |  |  |  |  |  |  |  |
Estimated service life |  |  |  |  |  |  |  |  | 10 years |  |
Adjustments for New Accounting Principle [Member] | Reclassification of Debt [Member] |  |  |  |  |  |  |  |  |  |  |
Recently Adopted Accounting Standards [Abstract] |  |  |  |  |  |  |  |  |  |  |
Unamortized debt issuance costs |  |  |  |  | 879,000 |  |  |  |  | 879,000 |
Adjustments for New Accounting Principle [Member] | Reclassification to Current Portion [Member] |  |  |  |  |  |  |  |  |  |  |
Recently Adopted Accounting Standards [Abstract] |  |  |  |  |  |  |  |  |  |  |
Unamortized debt issuance costs |  |  |  |  | 110,000 |  |  |  |  | 110,000 |
Adjustments for New Accounting Principle [Member] | Reclassification to Noncurrent Portion [Member] |  |  |  |  |  |  |  |  |  |  |
Recently Adopted Accounting Standards [Abstract] |  |  |  |  |  |  |  |  |  |  |
Unamortized debt issuance costs |  |  |  |  | $ 769,000 |  |  |  |  | $ 769,000 |
Options [Member] |  |  |  |  |  |  |  |  |  |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] |  |  |  |  |  |  |  |  |  |  |
Antidilutive securities excluded from effect of dilutive options and warrants (in shares) | shares |  |  |  |  |  |  |  |  | 1,100 | 0 | 77,000
Exercise price (in dollars per share) | $ / shares | $ 34.17 |  |  |  |  |  |  |  | $ 34.17 |  |
Options [Member] | Minimum [Member] |  |  |  |  |  |  |  |  |  |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] |  |  |  |  |  |  |  |  |  |  |
Exercise price (in dollars per share) | $ / shares |  |  |  |  |  |  |  |  |  |  | $ 13.65
Options [Member] | Maximum [Member] |  |  |  |  |  |  |  |  |  |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] |  |  |  |  |  |  |  |  |  |  |
Exercise price (in dollars per share) | $ / shares |  |  |  |  |  |  |  |  |  |  | $ 19.94
Warrants [Member] |  |  |  |  |  |  |  |  |  |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] |  |  |  |  |  |  |  |  |  |  |
Antidilutive securities excluded from effect of dilutive options and warrants (in shares) | shares |  |  |  |  |  |  |  |  |  | 0 |

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