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Income Taxes (Details) - USD ($)	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017	Dec. 31, 2017
Income Taxes
Effective tax rate			21.00%		35.00%
Income tax (benefit) expense	$ 1,781,000	$ 942,000	$ 5,427,000	$ 3,884,000
Fuel tax credits	1,100,000	$ 900,000	$ 2,100,000	$ 1,600,000
Withholding tax on dividends			10.00%
Dividend withholding tax between countries			5.00%
Liability for uncertain tax positions	$ 0		$ 0

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- Definition

Dividend Withholding Tax Between Countries

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- Definition

MITL withholding tax on dividends paid to non-resident shareholders

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- Definition

Recorded Investment Tax Credit

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- Definition

Percentage of domestic federal statutory tax rate applicable to pretax income (loss).

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 50
-Paragraph 12
-URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32687-109319

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-URI http://asc.fasb.org/extlink&oid=34349781&loc=d3e330036-122817

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-Paragraph 13
-URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32698-109319

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- Definition

Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 50
-Paragraph 9
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Amount recognized for uncertainty in income taxes classified as noncurrent.

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