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Provision for Taxes (Effective income tax rate reconciliation) (Details)
12 Months Ended
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%)