Financial Instruments and Fair Value Disclosures (Carrying and FV) (Details) - USD ($)	Jun. 30, 2021	Mar. 31, 2021
Fair value
Carrying Value	$ 579,138,211	$ 591,472,044
Corsair Japanese Financing
Fair value
Carrying Value	40,083,333	40,895,833
Corsair Japanese Financing | Level 2
Fair value
Fair Value	43,013,554	44,298,064
Concorde Japanese Financing
Fair value
Carrying Value	44,692,308	45,500,000
Concorde Japanese Financing | Level 2
Fair value
Fair Value	48,507,271	49,791,680
Corvette Japanese Financing
Fair value
Carrying Value	45,230,769	46,038,462
Corvette Japanese Financing | Level 2
Fair value
Fair Value	49,119,300	50,376,434
CMNL Japanese Financing
Fair value
Carrying Value	16,364,435	16,706,845
CMNL Japanese Financing | Level 2
Fair value
Fair Value	17,900,628	18,792,993
CNML Japanese Financing
Fair value
Carrying Value	18,504,315	18,855,655
CNML Japanese Financing | Level 2
Fair value
Fair Value	$ 20,264,256	$ 21,195,305