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Note 8 - Acquisitions - Assets Acquired and Liabilities Assumed (Details) - USD ($)	Mar. 31, 2017	Jul. 18, 2016	Mar. 31, 2016
ASSETS
Goodwill	$ 4,417,605		$ 275,408
Contrail Aviation Inc. [Member]
ASSETS
Goodwill		$ 4,227,205
Contrail Aviation Inc. [Member] \| Contrail Aviation Support LLC. [Member]
ASSETS
Accounts receivable		1,357,499
Inventories		2,118,475
Prepaid expenses		30,121
Property and equipment		33,095
Total assets		8,656,095
LIABILITIES
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]
ASSETS
Intangible assets		69,700
Contrail Aviation Inc. [Member] \| Contrail Aviation Support LLC. [Member] \| Trade Names [Member]
ASSETS
Intangible assets		322,000
Contrail Aviation Inc. [Member] \| Contrail Aviation Support LLC. [Member] \| Certification Marks [Member]
ASSETS
Intangible assets		47,000
Contrail Aviation Inc. [Member] \| Contrail Aviation Support LLC. [Member] \| Customer Relationships [Member]
ASSETS
Intangible assets		$ 451,000