Note 5 - Goodwill and Indefinite-lived Intangibles (Details Textual) - USD ($) $ in Thousands		3 Months Ended
May 31, 2018	Dec. 31, 2018	Jun. 30, 2018
Impairment of Intangible Assets (Excluding Goodwill), Total	$ 0
Goodwill, Impairment Loss			$ 1,300
Energy Segment [Member] \| Orbital UK Reporting Unit [Member]
Goodwill, Impairment Loss		$ 3,100

Amount of loss from the write-down of an asset representing the future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
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Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
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