Note 7 - Restructuring Charges (Details Textual) $ in Thousands	3 Months Ended
Mar. 31, 2021 USD ($)	Mar. 31, 2020 USD ($)
Restructuring Charges, Total	$ 219
Disposal Group, Not Discontinued Operation, Gain (Loss) on Disposal	(28)
Consolidation of our Production Facilities and Closure of our Merrifield, Minnesota Facility [Member]
Restructuring Charges, Total	219
Restructuring Reserve, Ending Balance	$ 0
Restructuring and Related Cost, Number of Positions Eliminated	42
Disposal Group, Not Discontinued Operation, Gain (Loss) on Disposal	$ (28)

Amount before tax of gain (loss) recognized on the sale or disposal of a disposal group. Excludes discontinued operations.

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
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-SubTopic 10
-Section 45
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Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
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Reference 3: http://www.xbrl.org/2003/role/disclosureRef
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The number of positions eliminated during the period as a result of restructuring activities.

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Amount of expenses associated with exit or disposal activities pursuant to an authorized plan. Excludes expenses related to a discontinued operation or an asset retirement obligation.

+ References

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Carrying amount (including both current and noncurrent portions of the accrual) as of the balance sheet date pertaining to a specified type of cost associated with exit from or disposal of business activities or restructuring pursuant to a duly authorized plan.

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