Financial Instruments and Fair Value Disclosures (Carrying and FV) (Details) - USD ($)	Sep. 30, 2021	Mar. 31, 2021
Fair value
Carrying Value	$ 566,864,229	$ 591,472,044
Corsair Japanese Financing
Fair value
Carrying Value	39,270,834	40,895,833
Corsair Japanese Financing | Level 2
Fair value
Fair Value	41,748,000	44,298,064
Concorde Japanese Financing
Fair value
Carrying Value	43,884,615	45,500,000
Concorde Japanese Financing | Level 2
Fair value
Fair Value	47,143,867	49,791,680
Corvette Japanese Financing
Fair value
Carrying Value	44,423,077	46,038,462
Corvette Japanese Financing | Level 2
Fair value
Fair Value	47,744,482	50,376,434
CMNL Japanese Financing
Fair value
Carrying Value	16,022,024	16,706,845
CMNL Japanese Financing | Level 2
Fair value
Fair Value	17,277,103	18,792,993
CNML Japanese Financing
Fair value
Carrying Value	18,152,976	18,855,655
CNML Japanese Financing | Level 2
Fair value
Fair Value	$ 19,593,552	$ 21,195,305