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Summary of Significant Accounting Policies (Details)
 3 Months Ended 12 Months Ended
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