Note 9 - Acquisitions (Details Textual)					1 Months Ended		9 Months Ended	12 Months Ended		17 Months Ended
	Dec. 15, 2017 USD ($)	Oct. 31, 2016 USD ($)	Oct. 03, 2016 USD ($) a	Jul. 18, 2016 USD ($)	Oct. 31, 2017 USD ($)	May 31, 2017 USD ($)	Dec. 31, 2017 USD ($)	Mar. 31, 2018 USD ($)	Mar. 31, 2017 USD ($)	Dec. 31, 2017 USD ($)
Business Combination, Contingent Consideration, Liability, Current								$ 1,500,000
Proceeds from Noncontrolling Interests								252,000
Payments to Noncontrolling Interests								948,000
Redeemable Minority Interest, Period Increase (Decrease)								549,000	549,000
Deferred Income Tax Expense (Benefit), Total								(10,566)	(659,000)
Business Combination, Bargain Purchase, Gain Recognized, Amount, Net								501,880
Goodwill, Ending Balance								4,417,605	4,417,605
Chief Investment Officer [Member]
Annual Salary After the Acquisition	$ 50,000
Chief Operating Officer and Chief Financial Officer [Member]
Annual Salary After the Acquisition	125,000
Contrail Aviation Inc. [Member]
Business Combination, Contingent Consideration Arrangement, EBITDA During Earnout Period					$ 2,100,000					$ 2,100,000
Business Combination, Contingent Consideration Arrangement, Earnout Payment Respect Earnout Period					1,000,000					$ 1,000,000
Business Combination, Contingent Consideration, Liability, Total								1,955,000
Goodwill, Ending Balance				$ 4,227,205
Contrail Aviation Inc. [Member] | Other Noncurrent Liabilities [Member]
Business Combination, Contingent Consideration Arrangement, Earnout Payment									$ 2,900,000
Business Combination, Contingent Consideration, Liability, Noncurrent								455,000
Contrail Aviation Inc. [Member] | Accrued Expense [Member]
Business Combination, Contingent Consideration, Liability, Current								1,500,000
Blue Clay Capital Management, LLC [Member]
Business Combination, Consideration Transferred, Total	$ 1
Business Combination, Conversion Agreement, Aggregate Capital Accounts of Each Fund, Percent							1.00%			1.00%
Business Combination, Conversion Agreement, Aggregate Capital Accounts of Each Fund, Amount							$ 100,000			$ 100,000
Business Combination, Fair Value Amount for Each General Partnership Interest							227,000
Blue Clay Capital Management, LLC [Member] | BCCP LO [Member]
Business Combination, Conversion Agreement, Aggregate Capital Accounts of Each Fund, Amount							$ 10,000			$ 10,000
Contrail Aviation Support LLC. [Member] | Contrail Aviation Inc. [Member]
Payments to Acquire Businesses, Gross				$ 4,033,368
Business Combination, Equity Interests in Acquiree, Percentage				21.00%
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Cash and Equivalents				$ 904,000
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
Contrail Aviation Support LLC. [Member] | Contrail Aviation Inc. [Member] | EBITDA Range 1 [Member]
Business Combination, Contingent Consideration Arrangement, Earnout Payment				0
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
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
Stratus Aero Partners LLC [Member] | Jet Yard, LLC [Member]
Payments to Acquire Businesses, Gross			$ 15,000
Business Acquisition, Percentage of Voting Interests Acquired			100.00%
Stratus Aero Partners LLC [Member] | Jet Yard, LLC [Member] | Lease Contract with Pinal Country, Arizona [Member]
Area of Total Facility | a			48.5
Lessee, Operating Lease, Renewal Term			30 years
Area of Lease Facility | a			2.6
Operating Lease, Lessee, Initial Annual Rent, Amount			$ 27,000
Operating Lease, Lessee, Annual Rent, After Annual Increments, Amount			$ 152,000
Operating Lease, Lessee, Annual Rent, Increase Percentage			5.00%
Operating Lease, Lessee, Annual Rent Increase, Incremental Period			3 years
Global Aviation Services, LLC [Member] | D&D GSE Support, Inc. [Member]
Payments to Acquire Businesses, Gross		$ 400,000
Business Combination, Contingent Consideration Arrangements, Range of Outcomes, Value, High		100,000			$ 100,000
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
Business Combination, Consideration Transferred, Total		700,000
Business Combination, Consideration Transferred, Liabilities Incurred		0
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Tangible Assets		200,000
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill, Total		300,000
Goodwill, Ending Balance		200,000
Global Aviation Partners Llc and Global Aviation Service [Member] | Jet Yard, LLC [Member]
Payments to Acquire Businesses, Gross			$ 400,000
Business Combination, Contingent Consideration Arrangements, Range of Outcomes, Value, High			100,000
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
Deferred Tax Assets, Net of Valuation Allowance, Current, Ending Balance		$ 0