Financial Instruments and Fair Value Disclosures (Carrying and FV) (Details) - USD ($)	Mar. 31, 2019	Mar. 31, 2018
Fair value
Carrying Value	$ 696,090,786	$ 759,103,152
Corsair Japanese Financing
Fair value
Carrying Value	47,395,833	50,645,833
Corsair Japanese Financing | Level 2
Fair value
Fair Value	45,901,900	50,645,833
Concorde Japanese Financing
Fair value
Carrying Value	51,961,538	55,192,308
Concorde Japanese Financing | Level 2
Fair value
Fair Value	50,176,288	55,192,308
Corvette Japanese Financing
Fair value
Carrying Value	52,500,000	55,730,769
Corvette Japanese Financing | Level 2
Fair value
Fair Value	50,671,689	$ 55,730,769
CJNP Japanese Financing
Fair value
Carrying Value	20,506,250
CJNP Japanese Financing | Level 2
Fair value
Fair Value	20,918,881
CMNL Japanese Financing
Fair value
Carrying Value	19,446,131
CMNL Japanese Financing | Level 2
Fair value
Fair Value	19,862,056
CNML Japanese Financing
Fair value
Carrying Value	21,666,369
CNML Japanese Financing | Level 2
Fair value
Fair Value	$ 22,137,090