Note 9 - Acquisitions (Tables)

12 Months Ended

Mar. 31, 2018

Acquired Inventory and Principal Business Assets, and Assumed Specified Liabilities, of Aircraft Instrument and Radio Company, Incorporated, and Aircraft Instrument and Radio Services, Inc. [Member]

Notes Tables

Schedule of Recognized Identified Assets Acquired and Liabilities Assumed [Table Text Block]

	May 2, 2017
Assets acquired and liabilities assumed at fair value:
Accounts receivables	$	748,936
Inventories		3,100,000
Property and equipment		26,748
Accounts payable		(313,117	)
Accrued expenses		(382,687	)
Net assets acquired	$	3,179,880
Net assets acquired		3,179,880
Consideration paid		2,400,000
Bargain purchase gain	$	779,880

Contrail Aviation Inc. [Member]

Notes Tables

Schedule of Recognized Identified Assets Acquired and Liabilities Assumed [Table Text Block]

	July 18, 2016
ASSETS
Accounts receivable	$	1,357,499
Inventories		2,118,475
Prepaid expenses		30,121
Property and equipment		33,095
Intangible assets - non-compete		69,700
Intangible assets - tradename		322,000
Intangible assets - certification		47,000
Intangible assets - customer relationship		451,000
Goodwill		4,227,205
Total assets	$	8,656,095
LIABILITIES
Accounts payable	$	366,575
Accrued expenses		43,652
Earnout liability		2,900,000
Total liabilities	$	3,310,227
Net Assets	$	5,345,868