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Note 13 - Related Party Matters (Details Textual)
3 Months Ended 11 Months Ended
Jun. 30, 2017
USD ($)
a
Jun. 30, 2017
USD ($)
a
Jul. 18, 2016
ft²
Company Controlled by Company's Officer and Directors [Member] | Little Mountain Airport [Member]      
Area of Real Estate Property | a 68 68  
Operating Leases Monthly Rent $ 14,862    
Number of Additional Lease Option Periods 3    
Lessee, Operating Lease, Renewal Term 2 years    
Contrail Aviation Support, Inc. [Member] | Contrail Aviation Support LLC. [Member]      
Area of Real Estate Property | ft²     21,000
Lessee, Operating Lease, Renewal Term 5 years    
Operating Lease, Payments   $ 111,189