Investments (Amortized cost and fair value) (Details) - USD ($) $ in Thousands	Sep. 30, 2023	Apr. 01, 2023
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	$ 20,584	$ 19,335
Fair Value	19,821	18,555
Residential mortgage-backed securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	2,254	2,567
Fair Value	2,168	2,488
State and political subdivision debt securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	5,911	6,023
Fair Value	5,687	5,769
Corporate debt securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	12,419	10,745
Fair Value	$ 11,966	$ 10,298