Financial Instruments and Fair Value Disclosures (Carrying and FV) (Details) - USD ($)	Sep. 30, 2020	Mar. 31, 2020
Fair value
Carrying Value	$ 634,498,695	$ 634,975,219
Corsair Japanese Financing
Fair value
Carrying Value	42,520,833	44,145,833
Corsair Japanese Financing | Level 2
Fair value
Fair Value	47,342,515	48,867,762
Concorde Japanese Financing
Fair value
Carrying Value	47,115,385	48,730,769
Concorde Japanese Financing | Level 2
Fair value
Fair Value	52,917,381	54,407,677
Corvette Japanese Financing
Fair value
Carrying Value	47,653,846	49,269,231
Corvette Japanese Financing | Level 2
Fair value
Fair Value	53,579,174	55,059,323
CJNP Japanese Financing
Fair value
Carrying Value	18,335,000	19,058,750
CJNP Japanese Financing | Level 2
Fair value
Fair Value	20,126,203	21,006,399
CMNL Japanese Financing
Fair value
Carrying Value	17,391,667	18,076,488
CMNL Japanese Financing | Level 2
Fair value
Fair Value	19,454,148	20,238,260
CNML Japanese Financing
Fair value
Carrying Value	19,558,333	20,261,012
CNML Japanese Financing | Level 2
Fair value
Fair Value	$ 21,918,443	$ 22,728,984