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Revenue Recognition, Adoption of ASC Topic 606 (Details)		3 Months Ended			6 Months Ended		12 Months Ended
		Sep. 30, 2018 USD ($)	Sep. 30, 2017 USD ($)	Jun. 30, 2017 USD ($)	Sep. 30, 2018 USD ($) $ / Core	Sep. 30, 2017 USD ($)	Mar. 31, 2018 USD ($)	Mar. 31, 2017 USD ($)	Mar. 31, 2016 USD ($)
Revenue Recognition [Abstract]
Percentage of possible scrap and liquidation value of part					100.00%
Reserves for excess and obsolete inventory		$ 10,027,000			$ 10,027,000		$ 6,682,000
Retained earnings		77,274,000			77,274,000		78,510,000
Revenues		127,939,000	$ 110,261,000	$ 94,695,000	219,607,000	$ 204,956,000
Cost of goods sold		$ 102,228,000	84,234,000	68,843,000	$ 177,544,000	153,077,000
Minimum [Member]
Revenue Recognition [Abstract]
Amortization period for core premiums					6 years
Maximum [Member]
Revenue Recognition [Abstract]
Remanufactured cores nominal price (in dollars per core) | $ / Core					0.01
Percentage of stock adjustment returns					5.00%
Percentage of aggregate returns					20.00%
Amortization period for core premiums					8 years
Adoption of ASC 606 [Member] | ASC 606 [Member]
Revenue Recognition [Abstract]
Reserves for excess and obsolete inventory	[1]						2,544,000
Retained earnings							742,000		$ 345,000
Revenues			(592,000)	456,000		(136,000)	557,000	$ (824,000)
Cost of goods sold			$ (378,000)	$ (381,000)		$ (759,000)	$ 66,000	$ (758,000)
[1] The allowance for excess and obsolete inventory of $2,544,000 previously included in long-term core inventory has been reclassified to inventory-net in the consolidated balance sheet at March 31, 2018.

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These core premiums are amortized over a period. Core premiums expected to be amortized during the Company's normal operating cycle, which is generally one year, are classified as short-term contract assets.

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Percentage of aggregate returns of units from customers.

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The percentage of possible scrap and liquidation value if no liquidation market exists for the part.

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Percentage of stock adjustment returns from customers.

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Remanufactured cores, portion of the product shipped, nominal price per unit.

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The aggregate costs related to goods produced and sold and services rendered by an entity during the reporting period. This excludes costs incurred during the reporting period related to financial services rendered and other revenue generating activities.

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Amount of valuation reserve for inventory.

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