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Note 15 - Commitments and Contingencies (Details Textual) - Contrail Aviation Inc. [Member] - USD ($)
Jun. 30, 2018
Jul. 18, 2016
Business Combination, Contingent Consideration, Liability, Total $ 1,955,000  
Accrued Expense [Member]    
Business Combination, Contingent Consideration, Liability, Current 1,500,000  
Other Noncurrent Liabilities [Member]    
Business Combination, Contingent Consideration, Liability, Noncurrent $ 455,000  
Contrail Aviation Support LLC. [Member]    
Business Combination, Contingent Consideration Arrangements, Range of Outcomes, Value High, Per Year   $ 1,500,000
Business Combination, Contingent Consideration Arrangements, Range of Outcomes, Value, High   $ 3,000,000