Fair values of our marketable securities aggregated by credit rating (Details) - USD ($)	Sep. 30, 2023	Mar. 31, 2023
Financing Receivable, Credit Quality Indicator [Line Items]
Marketable Securities	$ 53,700,402	$ 52,544,283
Standard & Poor's, AAA Rating [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Marketable Securities	8,134,255
Standard & Poor's, AA Rating [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Marketable Securities	6,622,847
Standard & Poor's, AA- Rating [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Marketable Securities	20,699,684
Standard & Poor's, A+ Rating [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Marketable Securities	2,833,709
Standard & Poor's, A Rating [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Marketable Securities	9,467,058
Standard & Poor's, A- Rating [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Marketable Securities	$ 5,942,849