Note 7 - Impairement Losses and Restructuring Cost (Details Textual) - USD ($) $ in Thousands	9 Months Ended	12 Months Ended
Dec. 31, 2018	Dec. 31, 2019
Goodwill, Impairment Loss		$ 7,146
Gain (Loss) on Disposition of Property Plant Equipment, Total	$ (483)	(0)
Employee Severance [Member] \| Aegis Transaction Agreement [Member]
Restructuring and Related Cost, Expected Cost Remaining		1,275
Employee Severance [Member] \| Closure of Site in Argentina [Member]
Restructuring and Related Cost, Expected Cost Remaining		51
Facility Closing [Member] \| Aegis Transaction Agreement [Member]
Restructuring and Related Cost, Expected Cost Remaining		478
Facility Closing [Member] \| Closure of Site in Argentina [Member]
Restructuring and Related Cost, Expected Cost Remaining		$ 36

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
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 20
-Section 50
-Paragraph 2
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-URI http://asc.fasb.org/extlink&oid=108376223&loc=d3e13854-109267

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
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-SubTopic 10
-Section 45
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-URI http://asc.fasb.org/extlink&oid=118932676&loc=d3e3602-108585

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 20
-Section 50
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-URI http://asc.fasb.org/extlink&oid=108376223&loc=d3e13816-109267

Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 20
-Section 45
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-URI http://asc.fasb.org/extlink&oid=99380562&loc=d3e13777-109266

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Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration