General Information and Recent Events (Details)	Jun. 30, 2020 vessel
NBHC
Property, Plant and Equipment [Line Items]
Ownership percentage	33.33333%
NBHC \| Owner of a deck barge
Property, Plant and Equipment [Line Items]
Ownership percentage	50.00%
Panamax
Property, Plant and Equipment [Line Items]
Number of vessels	2
Ultramax Ice Class 1C
Property, Plant and Equipment [Line Items]
Number of vessels	2
Supramax
Property, Plant and Equipment [Line Items]
Number of vessels	8
Panamax Ice Class 1A
Property, Plant and Equipment [Line Items]
Number of vessels	6

The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 323
-SubTopic 10
-Section 50
-Paragraph 3
-Subparagraph (a)(1)
-URI http://asc.fasb.org/extlink&oid=114001798&loc=d3e33918-111571

Name:	us-gaap_EquityMethodInvestmentOwnershipPercentage
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant