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Note 3 - Business Combinations (Details Textual) - USD ($)
1 Months Ended 3 Months Ended 6 Months Ended
Jul. 31, 2018
May 04, 2018
Jun. 07, 2017
May 31, 2017
Sep. 30, 2018
Jun. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Business Combination, Bargain Purchase, Gain Recognized, Amount, Net           $ 1,983,777 $ 501,880
Payments to Acquire Equity Method Investments               263,492
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, Acquisition Related Costs               83,000  
Blue Clay Capital Management, LLC [Member]                  
Business Combination, Fair Value Amount for Each General Partnership Interest           $ 227,000      
Ambry Hill Technologies, LLC [Member]                  
Payments to Acquire Businesses, Gross $ 50,000                
Business Acquisition, Percentage of Voting Interests Acquired 100.00%                
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%