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Note 9 - Acquisitions - Assets Acquired and Liabilities Assumed by AirCo (Details) - USD ($)
12 Months Ended
Jun. 01, 2017
Mar. 31, 2018
Mar. 31, 2017
Consideration paid   $ 2,400,000 $ 4,573,700
AirCo [Member] | 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]      
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    
Consideration paid 2,400,000    
Bargain purchase gain $ 779,880