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Provision for Taxes (Effective income tax rate reconciliation) (Details) | 12 Months Ended
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Mar. 31, 2022 | Mar. 31, 2021 | Mar. 31, 2020
Effective Income Tax Rate Reconciliation, Percent [Abstract] |  |  |
Statutory federal income tax rate | 21.00% | 21.00% | 21.00%
Increase (Reduction) in Rate Resulting from [Abstract] |  |  |
NOL tax rate benefit | 0.00% | 0.00% | (38.62%)
State taxes, net of federal benefit | 3.24% | 2.53% | 0.02%
Foreign rate differential | 0.05% | 0.00% | 0.21%
Federal tax credits | 0.19% | 0.99% | 0.53%
Transition tax | 0.00% | 0.00% | 0.00%
Tax exempt income | (0.03%) | (0.08%) | (0.17%)
Dividends received deduction | 0.00% | 0.01% | 0.01%
Other | (0.20%) | 0.87% | 1.19%
Actual tax expense of operations | 23.87% | 23.32% | (16.91%)

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- Definition Percentage of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to deduction for dividend. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 6.I.Fact.4) -URI http://asc.fasb.org/extlink&oid=122134291&loc=d3e330036-122817 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=121826272&loc=d3e32687-109319 + Details
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