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Summary of Significant Accounting Policies, Inventory (Details) - USD ($) | 12 Months Ended |
--- | --- | ---
Mar. 31, 2018 | Mar. 31, 2017
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 |
Reserve for excess and obsolete inventory | $ 6,682,000 | $ 4,125,000
Period of normal operating cycle | 1 year |
Maximum [Member] |  |
Inventory [Abstract] |  |
Percentage of inventory reserve to cost if no liquidation market exists for part | 100.00% |

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