Fixed Assets (Details) - USD ($)	Jun. 30, 2018	Dec. 31, 2017
Property, Plant and Equipment [Line Items]
Vessels, net	$ 285,432,054	$ 303,211,277
Other fixed assets, net	3,214,618	3,081,378
Total fixed assets, net	288,646,672	306,292,655
Capital lease asset, net	42,376,967	29,994,212
mv BULK PANGAEA [Member]
Property, Plant and Equipment [Line Items]
Vessels, net	15,670,750	16,398,650
mv BULK PATRIOT [Member]
Property, Plant and Equipment [Line Items]
Vessels, net	10,468,963	11,111,437
mv BULK JULIANA [Member]
Property, Plant and Equipment [Line Items]
Vessels, net	10,999,480	11,411,052
mv NORDIC ODYSSEY [Member]
Property, Plant and Equipment [Line Items]
Vessels, net	24,959,120	25,634,743
mv Nordic Orion [Member]
Property, Plant and Equipment [Line Items]
Vessels, net	25,781,699	26,467,928
mv BULK TRIDENT [Member]
Property, Plant and Equipment [Line Items]
Vessels, net	0	14,195,098
Capital lease asset, net	12,961,520	0
mv BULK BEOTHUK [Member]
Property, Plant and Equipment [Line Items]
Capital lease asset, net	6,684,671	6,840,362
mv BULK NEWPORT [Member]
Property, Plant and Equipment [Line Items]
Vessels, net	14,475,047	13,139,242
mv NORDIC BARENTS [Member]
Property, Plant and Equipment [Line Items]
Vessels, net	4,611,450	4,846,522
mv NORDIC BOTHNIA [Member]
Property, Plant and Equipment [Line Items]
Vessels, net	4,559,934	4,787,388
mv NORDIC OSHIMA [Member]
Property, Plant and Equipment [Line Items]
Vessels, net	29,510,052	30,122,172
mv NORDIC OLYMPIC [Member]
Property, Plant and Equipment [Line Items]
Vessels, net	29,935,017	30,548,435
mv NORDIC ODIN [Member]
Property, Plant and Equipment [Line Items]
Vessels, net	29,761,407	30,371,285
mv Nordic Bulk Oasis [Member]
Property, Plant and Equipment [Line Items]
Vessels, net	30,994,718	31,608,785
m/v Bulk Endurance [Member]
Property, Plant and Equipment [Line Items]
Vessels, net	26,525,712	27,030,918
mv Bulk Freedom [Member]
Property, Plant and Equipment [Line Items]
Vessels, net	8,650,902	8,834,746
m/v Bulk Pride [Member]
Property, Plant and Equipment [Line Items]
Vessels And Vessel Improvements Property Plant And Equipement Gross	13,806,726	14,007,731
m/v Bulk PODS [Member] [Domain]
Property, Plant and Equipment [Line Items]
Vessels And Vessel Improvements Property Plant And Equipement Gross	2,137,500	0
Miss Nora G. Pearl [Member]
Property, Plant and Equipment [Line Items]
Vessels And Vessel Improvements Property Plant And Equipement Gross	2,583,577	2,695,145
m/v Bulk Destiny [Member]
Property, Plant and Equipment [Line Items]
Capital lease asset, net	$ 22,730,776	$ 23,153,850