Amount of gain (loss) on sale or disposal of property, plant and equipment assets, including oil and gas property and timber property.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3602-108585

Name:	us-gaap_GainLossOnSaleOfPropertyPlantEquipment
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

Subsequent Events (Details)	1 Months Ended		12 Months Ended
Subsequent Events (Details)	Feb. 28, 2018 Aircraft	Jan. 31, 2018 USD ($) Aircraft	Dec. 31, 2017 USD ($)	Dec. 31, 2016 USD ($)
Subsequent Event [Line Items]
Gain on sale of aircraft			$ 791,500	$ 2,149,600
Subsequent Event [Member] \| Turboprop Aircraft [Member]
Subsequent Event [Line Items]
Number of aircraft sold \| Aircraft	1	1
Gain on sale of aircraft		$ 47,000