Financial Instruments and Fair Value Disclosures (Carrying and FV) (Details) - USD ($)	Jun. 30, 2019	Mar. 31, 2019
Fair value
Carrying Value	$ 680,842,955	$ 696,090,786
Corsair Japanese Financing
Fair value
Carrying Value	46,583,333	47,395,833
Corsair Japanese Financing | Level 2
Fair value
Fair Value	46,284,958	45,901,900
Concorde Japanese Financing
Fair value
Carrying Value	51,153,846	51,961,538
Concorde Japanese Financing | Level 2
Fair value
Fair Value	50,761,370	50,176,288
Corvette Japanese Financing
Fair value
Carrying Value	51,692,308	52,500,000
Corvette Japanese Financing | Level 2
Fair value
Fair Value	51,289,452	50,671,689
CJNP Japanese Financing
Fair value
Carrying Value	20,144,375	20,506,250
CJNP Japanese Financing | Level 2
Fair value
Fair Value	20,892,845	20,918,881
CMNL Japanese Financing
Fair value
Carrying Value	19,103,720	19,446,131
CMNL Japanese Financing | Level 2
Fair value
Fair Value	19,876,285	19,862,056
CNML Japanese Financing
Fair value
Carrying Value	21,315,030	21,666,369
CNML Japanese Financing | Level 2
Fair value
Fair Value	$ 22,191,997	$ 22,137,090