Financial Instruments and Fair Value Disclosures (Carrying and FV) (Details) - USD ($)	Dec. 31, 2020	Mar. 31, 2020
Fair value
Carrying Value	$ 603,923,327	$ 634,975,219
Corsair Japanese Financing
Fair value
Carrying Value	41,708,333	44,145,833
Corsair Japanese Financing | Level 2
Fair value
Fair Value	46,093,687	48,867,762
Concorde Japanese Financing
Fair value
Carrying Value	46,307,692	48,730,769
Concorde Japanese Financing | Level 2
Fair value
Fair Value	51,546,159	54,407,677
Corvette Japanese Financing
Fair value
Carrying Value	46,846,154	49,269,231
Corvette Japanese Financing | Level 2
Fair value
Fair Value	52,190,755	55,059,323
CJNP Japanese Financing
Fair value
Carrying Value		19,058,750
CJNP Japanese Financing | Level 2
Fair value
Fair Value		21,006,399
CMNL Japanese Financing
Fair value
Carrying Value	17,049,256	18,076,488
CMNL Japanese Financing | Level 2
Fair value
Fair Value	18,962,197	20,238,260
CNML Japanese Financing
Fair value
Carrying Value	19,206,994	20,261,012
CNML Japanese Financing | Level 2
Fair value
Fair Value	$ 21,397,160	$ 22,728,984