Financial Instruments and Fair Value Disclosures (Carrying and FV) (Details) - USD ($)	Dec. 31, 2018	Mar. 31, 2018
Fair value
Carrying Value	$ 711,330,757	$ 759,103,152
Corsair Japanese Financing
Fair value
Carrying Value	48,208,333	50,645,833
Corsair Japanese Financing | Level 2
Fair value
Fair Value	46,611,990	50,645,833
Concorde Japanese Financing
Fair value
Carrying Value	52,769,231	55,192,308
Concorde Japanese Financing | Level 2
Fair value
Fair Value	50,680,948	55,192,308
Corvette Japanese Financing
Fair value
Carrying Value	53,307,692	55,730,769
Corvette Japanese Financing | Level 2
Fair value
Fair Value	51,164,264	$ 55,730,769
CJNP Japanese Financing
Fair value
Carrying Value	20,868,125
CJNP Japanese Financing | Level 2
Fair value
Fair Value	21,428,814
CMNL Japanese Financing
Fair value
Carrying Value	19,788,542
CMNL Japanese Financing | Level 2
Fair value
Fair Value	20,331,022
CNML Japanese Financing
Fair value
Carrying Value	22,017,708
CNML Japanese Financing | Level 2
Fair value
Fair Value	$ 22,593,937