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Derivative Instruments and Fair Value Measurements (Details Textual)	3 Months Ended		6 Months Ended
	Jun. 30, 2017 USD ($)	Jun. 30, 2016 USD ($)	Jun. 30, 2017 USD ($)	Jun. 30, 2016 USD ($)	Dec. 31, 2016 USD ($)	Dec. 31, 2015 swap
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Derivative, Number of Instruments Held | swap						1
Interest Rate Swap [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Fixed Interest Rate						6.63%
Forward Contracts [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Derivative gain (loss)	$ 1,650,000		$ (1,075,000)
Swap [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Derivative gain (loss)	(173,000)	$ (1,265,000)	585,000	$ (948,000)
Fair Value, Measurements, Recurring [Member] | Interest Rate Swap [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Fair Value, Net Asset (Liability)		$ (104,000)		$ (104,000)
Fair Value, Measurements, Recurring [Member] | Forward Contracts [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Fair Value, Net Asset (Liability)	1,053,975		1,053,975		$ (20,950)
Fair Value, Measurements, Recurring [Member] | Swap [Member] | Fuel [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Fair Value, Net Asset (Liability)	$ (281,142)		$ (281,142)		$ 303,675

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- Definition

Fixed interest rate related to the interest rate derivative.

+ References

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- Definition

Amount of increase (decrease) in the fair value of derivatives recognized in the income statement.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 4A
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=64837297&loc=SL5618551-113959

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 4C
-Subparagraph (a),(c),(d),(e)
-URI http://asc.fasb.org/extlink&oid=64837297&loc=SL5624171-113959

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The number of derivative instruments of a particular group held by the entity.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 1B
-URI http://asc.fasb.org/extlink&oid=64837297&loc=SL5580258-113959

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 1A
-Subparagraph (d)
-URI http://asc.fasb.org/extlink&oid=64837297&loc=SL5579245-113959

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- Definition

Fair value of asset after deduction of liability.

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