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Note 9 - Acquisitions - Assets Acquired and Liabilities Assumed by Contrail Aviation (Details) - USD ($)	Mar. 31, 2018	Mar. 31, 2017	Jul. 18, 2016
Goodwill	$ 4,417,605	$ 4,417,605
Contrail Aviation Inc. [Member]
Goodwill			$ 4,227,205
Contrail Aviation Inc. [Member] \| Contrail Aviation Support LLC. [Member]
Accounts receivable			1,357,499
Inventories			2,118,475
Prepaid expenses			30,121
Property and equipment			33,095
Total assets			8,656,095
Accounts payable			366,575
Accrued expenses			43,652
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Earnout Liability			2,900,000
Total liabilities			3,310,227
Net Assets			5,345,868
Contrail Aviation Inc. [Member] \| Contrail Aviation Support LLC. [Member] \| Noncompete Agreements [Member]
Intangible assets			69,700
Contrail Aviation Inc. [Member] \| Contrail Aviation Support LLC. [Member] \| Trade Names [Member]
Intangible assets			322,000
Contrail Aviation Inc. [Member] \| Contrail Aviation Support LLC. [Member] \| Certification Marks [Member]
Intangible assets			47,000
Contrail Aviation Inc. [Member] \| Contrail Aviation Support LLC. [Member] \| Customer Relationships [Member]
Intangible assets			$ 451,000