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Note 3 - Business Combinations (Details Textual) - USD ($)
1 Months Ended 3 Months Ended
May 04, 2018
Jun. 07, 2017
May 31, 2017
Jun. 30, 2018
Jun. 30, 2017
Business Combination, Bargain Purchase, Gain Recognized, Amount, Net       $ 1,983,777 $ 501,880
Payments to Acquire Equity Method Investments       197,532
Worthington Aviation Parts, Inc [Member]          
Payments to Acquire Businesses, Gross $ 3,300,000        
Deferred Income Tax Expense (Benefit), Total       589,000  
Business Combination, Bargain Purchase, Gain Recognized, Amount, Net       1,983,000  
Payment for Earnest Money Deposit $ 50,000        
Business Combination, Pro Forma Information, Revenue of Acquiree since Acquisition Date, Actual       2,600,000  
Business Combination, Pro Forma Information, Earnings or Loss of Acquiree since Acquisition Date, Actual       165,000  
Blue Clay Capital Management, LLC [Member]          
Business Combination, Fair Value Amount for Each General Partnership Interest       227,000  
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]          
Payments to Acquire Businesses, Gross     $ 2,400,000    
Deferred Income Tax Expense (Benefit), Total       278,000  
Business Combination, Bargain Purchase, Gain Recognized, Amount, Net       $ 502,000  
SAIC [Member] | TFS Partners [Member]          
Payments to Acquire Equity Method Investments   $ 500,000      
Equity Method Investment, Ownership Percentage   40.00%      
TFS Partners [Member] | Fence Store LLC [Member]          
Equity Method Investment, Ownership Percentage   60.00%