Allowance for Credit Losses (Table Text Block)	12 Months Ended
	Mar. 31, 2023
Allowance For Credit Loss [Abstract]
Accounts Receivable Allowance For Credit Loss [Table Text Block]	Allowance for Credit Losses     Trade Receivables   Investments, Fixed Maturities   Investments, other   Total                       (In thousands)     Balance as of March 31, 2021 $ 4,421 $ 1,320 $ 501 $ 6,242 Provision for (reversal of) credit losses   4,228   (1,260)   –   2,968 Write-offs against allowance   –   –   –   – Recoveries   –   –   –   – Balance as of March 31, 2022 $ 8,649 $ 60 $ 501 $ 9,210 Provision for (reversal of) credit losses   (4,860)   2,041   16   (2,803) Write-offs against allowance   –   –   –   – Recoveries   –   –   –   – Balance as of March 31, 2023$ 3,789 $ 2,101 $ 517 $ 6,407