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Fair value measurements and Hedging: (Details Narrative) - USD ($)	18 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Dec. 31, 2019
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loss reclassified into earnings to be transferred	$ 1,621,000
Restricted cash, current		$ 29,094,000	$ 7,422,000
Fair Value, Inputs, Level 1 [Member] | 8.30% 2022 Notes [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
2022 Notes fair value		48,800,000
DSF $55.0 Facility [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt instrument fair value		55,667,000
Difference between Book and Fair Value		667,000
Debt instrument carrying amount		55,000,000
Derivative [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Restricted cash, current		22,617,000	$ 407,000
Bunker Swaps For 71,000 Metric Tons Fuel [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fixed bunker spread price		232
Bunker Swaps For 24,000 Metric Tons Fuel [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fixed bunker spread price		$ 106

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The fixed bunker spread price under a bunker swap agreement.

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The difference between the book and the fair value of the debt instrument payable.

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Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt.

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Fair value portion of debt instrument payable, including, but not limited to, notes payable and loans payable.

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The estimated value of gains (losses), net anticipated to be transferred in the future from accumulated other comprehensive income into earnings.

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Fair value portion of notes payable.

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Amount of cash and cash equivalents restricted as to withdrawal or usage, classified as current. Cash includes, but is not limited to, currency on hand, demand deposits with banks or financial institutions, and other accounts with general characteristics of demand deposits. Cash equivalents include, but are not limited to, short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates.

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