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Note 12 - Commitments and Contingencies (Details Textual) |  |  | 12 Months Ended |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | ---
Oct. 31, 2016 USD ($) | Jul. 18, 2016 USD ($) | Jul. 31, 2017 USD ($) | Sep. 30, 2017 USD ($) | Jun. 30, 2017 USD ($) | May 05, 2017 USD ($) | Mar. 31, 2017 USD ($) | Jun. 29, 2016 USD ($)
Agreements to Acquire Land and Construct New Headquarters Facility, Aggregate Amount |  |  |  |  |  |  |  | $ 1,900,000
Contrail Loan Agreement's, Revolving Line of Credit [Member] |  |  |  |  |  |  |  |
Guarantor Obligations, Maximum Exposure, Undiscounted |  |  |  |  |  | $ 1,600,000 |  |
Contrail Aviation Inc. [Member] | Other Noncurrent Liabilities [Member] |  |  |  |  |  |  |  |
Business Combination, Contingent Consideration Arrangement, Earnout Payment |  | $ 2,900,000 |  |  |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Earnout Liability |  |  |  |  | $ 2,900,000 |  | $ 2,900,000 |
Contrail Aviation Inc. [Member] | EBITDA Range 1 [Member] | Subsequent Event [Member] |  |  |  |  |  |  |  |
Business Combination, Contingent Consideration, Liability, Current |  |  | $ 1,000,000 |  |  |  |  |
Contrail Aviation Support LLC. [Member] | Contrail Aviation Inc. [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 |  |  |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Earnout Liability |  | 2,900,000 |  |  |  |  |  |
Payments to Acquire Businesses, Gross |  | 4,033,368 |  |  |  |  |  |
Contrail Aviation Support LLC. [Member] | Contrail Aviation Inc. [Member] | EBITDA Range 1 [Member] |  |  |  |  |  |  |  |
Business Combination, Contingent Consideration Arrangements, EBITDA Threshold |  | 1,500,000 |  |  |  |  |  |
Business Combination, Contingent Consideration Arrangement, Earnout Payment |  | 0 |  |  |  |  |  |
Contrail Aviation Support LLC. [Member] | Contrail Aviation Inc. [Member] | EBITDA Range 1 [Member] | Subsequent Event [Member] |  |  |  |  |  |  |  |
Earnings Before Interest, Tax, Depreciation and Amortization |  |  | $ 2,100,000 |  |  |  |  |
Contrail Aviation Support LLC. [Member] | Contrail Aviation Inc. [Member] | EBITDA Range 1 [Member] | Maximum [Member] |  |  |  |  |  |  |  |
Business Combination, Contingent Consideration Arrangements, EBITDA Threshold |  | 1,500,000 |  |  |  |  |  |
Contrail Aviation Support LLC. [Member] | Contrail Aviation Inc. [Member] | EBITDA Range 2 [Member] |  |  |  |  |  |  |  |
Business Combination, Contingent Consideration Arrangements, EBITDA Threshold |  | 1,500,000 |  |  |  |  |  |
Business Combination, Contingent Consideration Arrangement, Earnout Payment |  | $ 1,500,000 |  |  |  |  |  |
Business Combination, Contingent Consideration Arrangement, Earnout Payment Calculation, Multiplier |  | 2 |  |  |  |  |  |
Contrail Aviation Support LLC. [Member] | Contrail Aviation Inc. [Member] | EBITDA Range 2 [Member] | Maximum [Member] |  |  |  |  |  |  |  |
Business Combination, Contingent Consideration Arrangements, EBITDA Threshold |  | $ 2,000,000 |  |  |  |  |  |
Contrail Aviation Support LLC. [Member] | Contrail Aviation Inc. [Member] | EBITDA Range 2 [Member] | Minimum [Member] |  |  |  |  |  |  |  |
Business Combination, Contingent Consideration Arrangements, EBITDA Threshold |  | 1,500,000 |  |  |  |  |  |
Contrail Aviation Support LLC. [Member] | Contrail Aviation Inc. [Member] | EBITDA Range 3 [Member] |  |  |  |  |  |  |  |
Business Combination, Contingent Consideration Arrangement, Earnout Payment |  | 1,000,000 |  |  |  |  |  |
Contrail Aviation Support LLC. [Member] | Contrail Aviation Inc. [Member] | EBITDA Range 3 [Member] | Maximum [Member] |  |  |  |  |  |  |  |
Business Combination, Contingent Consideration Arrangements, EBITDA Threshold |  | 4,000,000 |  |  |  |  |  |
Contrail Aviation Support LLC. [Member] | Contrail Aviation Inc. [Member] | EBITDA Range 3 [Member] | Minimum [Member] |  |  |  |  |  |  |  |
Business Combination, Contingent Consideration Arrangements, EBITDA Threshold |  | 2,000,000 |  |  |  |  |  |
Contrail Aviation Support LLC. [Member] | Contrail Aviation Inc. [Member] | EBITDA Range 4 [Member] |  |  |  |  |  |  |  |
Business Combination, Contingent Consideration Arrangements, EBITDA Threshold |  | 1,500,000 |  |  |  |  |  |
Business Combination, Contingent Consideration Arrangement, Earnout Payment |  | 1,500,000 |  |  |  |  |  |
Contrail Aviation Support LLC. [Member] | Contrail Aviation Inc. [Member] | EBITDA Range 4 [Member] | Minimum [Member] |  |  |  |  |  |  |  |
Business Combination, Contingent Consideration Arrangements, EBITDA Threshold |  | 4,000,000 |  |  |  |  |  |
Contrail Aviation Support LLC. [Member] | Contrail Aviation Inc. [Member] | EBITDA Range 5 [Member] |  |  |  |  |  |  |  |
Business Combination, Contingent Consideration Arrangements, EBITDA Threshold |  | 15,000,000 |  |  |  |  |  |
Business Combination, Contingent Consideration Arrangement, Earnout Payment |  | 3,000,000 |  |  |  |  |  |
Contrail Aviation Support LLC. [Member] | Contrail Aviation Inc. [Member] | EBITDA Range 5 [Member] | Minimum [Member] |  |  |  |  |  |  |  |
Business Combination, Contingent Consideration Arrangements, EBITDA Threshold |  | $ 15,000,000 |  |  |  |  |  |
Global Aviation Services, LLC [Member] | D&D GSE Support, Inc. [Member] |  |  |  |  |  |  |  |
Business Combination, Contingent Consideration Arrangements, Range of Outcomes, Value, High | $ 100,000 |  |  |  |  |  |  |
Payments to Acquire Businesses, Gross | 400,000 |  |  |  |  |  |  |
Payments to Acquire Business, Additional Payment After Closing, Amount | 100,000 |  |  |  |  |  |  |
Payments to Acquire Business, Final Payment, Payable | 100,000 |  |  |  |  |  |  |
Payments to Acquire Business, Final Payment, Payable, Monthly Installments, Amount | $ 16,667 |  |  |  |  |  |  |
Global Aviation Services, LLC [Member] | D&D GSE Support, Inc. [Member] | Subsequent Event [Member] |  |  |  |  |  |  |  |
Business Combination, Contingent Consideration, Liability |  |  |  | $ 100,000 |  |  |  |

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