Face (par) amount of debt instrument at time of issuance.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 45
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=119993939&loc=d3e28551-108399

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 55
-Paragraph 8
-URI http://asc.fasb.org/extlink&oid=114775985&loc=d3e28878-108400

Name:	us-gaap_DebtInstrumentFaceAmount
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

Financial Instruments and Fair Value Disclosures (Details) - USD ($) $ in Millions	Dec. 31, 2020	Dec. 31, 2019	Nov. 22, 2019	Aug. 30, 2019
Alpha Bank Facility [Member]
Long-term debt [Abstract]
Face amount	$ 11.0	$ 11.0	$ 11.0
$5.0 Million Term Loan Facility [Member]
Long-term debt [Abstract]
Face amount	5.0
Thalassa [Member] \| $5.0 Million Term Loan Facility [Member]
Long-term debt [Abstract]
Face amount	$ 5.0			$ 5.0