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Income Taxes (Narrative) (Details) - USD ($) | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Mar. 31, 2019 | Dec. 31, 2019 | Dec. 31, 2018 | Mar. 31, 2020 | Mar. 31, 2019 | Mar. 31, 2018
Operating Loss Carryforwards [Line Items] |  |  |  |  |  |
Tax Cuts and Jobs Act, Change in Tax Rate, Income Tax Expense (Benefit) |  |  |  | $ 525,000 | $ 0 |
Deferred Tax Liability Lease Asset | $ 0 |  |  | (8,938,000) | 0 |
Deferred Tax Asset Lease Liability | $ 0 |  |  | 9,048,000 | 0 |
Effective Income Tax Rate Reconciliation, Deduction, Amount |  |  |  | $ 1,029,000 | $ 945,000 |
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent | 2100.00% |  | 3500.00% | 21.00% | 21.00% | 31.55%
Effective Income Tax Rate Reconciliation, Change in Enacted Tax Rate, Amount |  |  |  | $ (2,491,000) | $ (1,663,000) | $ 1,109,000
Effective Income Tax Rate Reconciliation, Foreign Income Tax Rate Differential, Amount |  |  |  |  | 1,500,000 | 1,500,000
Effective Income Tax Rate Reconciliation, Change in Enacted Tax Rate, Percent |  |  | 2100.00% |  |  |
Gross amounts of deferred tax assets | $ 90,403,000 |  |  | 93,401,000 | 90,403,000 |
Valuation allowance | (16,881,000) |  |  | (15,036,000) | (16,881,000) |
Foreign subsidiary income |  |  |  | 37,577,000 | 14,362,000 | 25,144,000
Undistributed Earnings of Foreign Subsidiaries |  |  |  | 137,000,000 |  |
Income Tax Effects Allocated Directly to Equity, Employee Stock Options |  |  |  | 169,000 | 1,129,000 |
Amount accrued for the payment of interest and penalties |  |  |  | 46,000 | 38,000 |
Federal |  |  |  |  |  |
Operating Loss Carryforwards [Line Items] |  |  |  |  |  |
Effective Income Tax Rate Reconciliation, Change in Enacted Tax Rate, Amount |  |  | $ 16,128,000 |  | 16,102,000 |
Foreign net operating losses | $ 2,372,000 |  |  | $ 2,696,000 | $ 2,372,000 | $ 3,837,000
Scenario, Adjustment [Member] | Federal |  |  |  |  |  |
Operating Loss Carryforwards [Line Items] |  |  |  |  |  |
Effective Income Tax Rate Reconciliation, Change in Enacted Tax Rate, Amount |  | $ 26,000 |  |  |  |

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