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Note 11 - Financing Arrangements (Details Textual)											9 Months Ended
Note 11 - Financing Arrangements (Details Textual)	Mar. 07, 2018 USD ($)	Feb. 15, 2018 USD ($)	Feb. 14, 2018 USD ($)	Jan. 31, 2018 USD ($)	Dec. 21, 2017 USD ($)	Dec. 20, 2017 USD ($)	Jun. 28, 2017	May 05, 2017 USD ($)	May 02, 2017 USD ($)	Jul. 18, 2016 USD ($)	Dec. 20, 2017 USD ($)	Mar. 31, 2018 USD ($)	Feb. 22, 2018 USD ($)	Jan. 01, 2018 USD ($)	Oct. 27, 2017 USD ($)	Mar. 31, 2017 USD ($)	Oct. 31, 2016 USD ($)
Long-term Debt, Total												$ 48,084,950
Short-term Debt, Total												9,229,690				$ 25,000
Interest Rate Swap for Term Note D [Member]
Derivative, Fixed Interest Rate		5.09%
Derivative, Notional Amount		$ 1,680,000
Derivative Liability, Total		58,000
Term Loan A [Member] \| Interest Rate Swap [Member]
Derivative, Notional Amount														$ 10,000,000
Derivative Liability, Fair Value, Gross Liability, Total												$ 8,500
Revolving Credit Facility [Member] \| Contrail Aviation Support LLC. [Member]
Line of Credit Facility, Maximum Borrowing Capacity										$ 12,000,000
Long-term Line of Credit, Total																0
Prior Revolving Credit Facility [Member]
Line of Credit Facility, Maximum Borrowing Capacity						$ 25,000,000					$ 25,000,000
Line of Credit Facility, Commitment Fee Percentage											0.15%
Debt Instrument, Interest Rate, Increase (Decrease)							0.25%
Prior Revolving Credit Facility [Member] \| London Interbank Offered Rate (LIBOR) [Member] \| Minimum [Member]
Debt Instrument, Basis Spread on Variable Rate						1.50%
Prior Revolving Credit Facility [Member] \| London Interbank Offered Rate (LIBOR) [Member] \| Maximum [Member]
Debt Instrument, Basis Spread on Variable Rate						2.00%
Contrail Loan Agreement's, Revolving Line of Credit [Member]
Line of Credit Facility, Maximum Borrowing Capacity	$ 20,000,000							$ 15,000,000
Debt Instrument, Basis Spread on Variable Rate	3.00%
Minimum Debt Service Coverage Ratio												1.1
Long-term Line of Credit, Total												$ 14,826,000
Guarantor Obligations, Maximum Exposure, Undiscounted								$ 1,600,000				1,600,000
Line of Credit Facility, Remaining Borrowing Capacity												$ 5,174,000
Minimum Cash Flow Coverage Ratio												2
Minimum Tangible Net Worth												$ 3,500,000
Contrail Loan Agreement's, Revolving Line of Credit [Member] \| London Interbank Offered Rate (LIBOR) [Member]
Debt Instrument, Basis Spread on Variable Rate								3.00%
MBT Credit Agreement [Member]
Minimum Debt Service Coverage Ratio												1.25
Minimum Asset Coverage Ratio												1.5
Term Loan [Member]
Debt Instrument, Basis Spread on Variable Rate									0.25%
Debt Instrument, Periodic Payment, Principal									$ 200,000
Short-term Debt, Total									$ 2,400,000
Additional ONB Loan Agreement [Member] \| Revolving Credit Facility [Member]
Line of Credit Facility, Maximum Borrowing Capacity				$ 9,920,000
Long-term Line of Credit, Total												$ 9,920,000
Line of Credit Facility, Percentage of Gross Lease Income of Collateral				70.00%
Additional ONB Loan Agreement [Member] \| Revolving Credit Facility [Member] \| London Interbank Offered Rate (LIBOR) [Member]
Debt Instrument, Basis Spread on Variable Rate				3.75%
Line of Credit Facility, Periodic Payment				$ 250,000
MBT [Member] \| Term Loan C [Member]
Debt Instrument, Face Amount		1,000,000
Debt Instrument, Periodic Payment, Principal		90,909	$ 158,333.33
MBT [Member] \| Term Note D [Member]
Debt Instrument, Face Amount		1,680,000
Debt Instrument, Periodic Payment, Principal		$ 5,600
MBT [Member] \| Term Note D [Member] \| London Interbank Offered Rate (LIBOR) [Member]
Debt Instrument, Basis Spread on Variable Rate		2.00%
MBT [Member] \| MBT Credit Agreement [Member]
Debt Agreement, Maximum Borrowing Capacity					$ 26,900,000
MBT [Member] \| MBT Credit Agreement [Member] \| Term Loan A [Member]
Long-term Debt, Total					$ 10,000,000
MBT [Member] \| MBT Credit Agreement [Member] \| Term Loan A [Member] \| Interest Rate Swap [Member]
Derivative, Fixed Interest Rate					4.56%
MBT [Member] \| MBT Credit Agreement [Member] \| Term Loan A [Member] \| London Interbank Offered Rate (LIBOR) [Member]
Debt Instrument, Basis Spread on Variable Rate					2.00%
MBT [Member] \| MBT Credit Agreement [Member] \| Term Loan B [Member]
Long-term Debt, Total					$ 5,000,000
Debt Instrument, Interest Rate, Stated Percentage					4.50%
MBT [Member] \| MBT Credit Agreement [Member] \| Term Loan C [Member]
Long-term Debt, Total					$ 1,900,000
MBT [Member] \| MBT Credit Agreement [Member] \| Term Loan C [Member] \| Minimum [Member]
Debt Instrument, Interest Rate, Stated Percentage					3.25%
MBT [Member] \| MBT Credit Agreement [Member] \| Term Loan C [Member] \| Prime Rate [Member]
Debt Instrument, Basis Spread on Variable Rate					(1.00%)
MBT [Member] \| MBT Credit Agreement [Member] \| Term Loan A and B [Member]
Debt Instrument, Term					10 years
MBT [Member] \| MBT Credit Agreement [Member] \| Revolving Credit Facility [Member]
Line of Credit Facility, Maximum Borrowing Capacity					$ 10,000,000
MBT [Member] \| MBT Credit Agreement [Member] \| Revolving Credit Facility [Member] \| Prime Rate [Member]
Debt Instrument, Basis Spread on Variable Rate					1.00%
BB&T [Member] \| Construction Loan Agreement [Member]
Line of Credit Facility, Maximum Borrowing Capacity																	$ 1,480,000
BMO Harris Bank N.A. [Member] \| Revolving Credit Facility [Member]
Line of Credit Facility, Maximum Borrowing Capacity																$ 3,200,000
Minimum Debt Service Coverage Ratio										1.75
Line of Credit Facility, Maximum Borrowing Capacity, Percentage of Eligible Inventory										75.00%
Line of Credit Facility, Maximum Borrowing Capacity, Maximum Value of Eligible Inventory Included in Borrowing Base										$ 9,000,000
Line of Credit Facility, Maximum Borrowing Capacity, Percentage of Outstanding Eligible Accounts Receivable										80.00%
Guarantor Obligations, Maximum Exposure, Undiscounted										$ 1,600,000
Maximum Ratio of Total Liabilities to Tangible Net Worth										2.5
Annual Operating Lease Payments Limitation										$ 10,000
BMO Harris Bank N.A. [Member] \| Revolving Credit Facility [Member] \| London Interbank Offered Rate (LIBOR) [Member]
Debt Instrument, Basis Spread on Variable Rate										2.80%
Minnesota Bank and Trust [Member] \| AirCo [Member]
Long-term Debt, Total												2,360,000
Debt Instrument, Face Amount															$ 3,441,000
Debt Issuance Costs, Net, Total												44,500
Minnesota Bank and Trust [Member] \| Revolving Credit Facility [Member] \| AirCo [Member]
Line of Credit Facility, Maximum Borrowing Capacity													$ 5,000,000
Debt Instrument, Interest Rate, Stated Percentage													7.50%
Long-term Line of Credit, Total												4,950,000
Debt Issuance Costs, Net, Total												$ 50,000