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Note 8 - Leases (Details Textual) $ in Thousands |  |  |  | 3 Months Ended | 6 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | --- | --- | --- | --- | ---
Aug. 16, 2021 USD ($) ft² | Jul. 19, 2021 USD ($) | Sep. 22, 2020 USD ($) | Sep. 30, 2021 USD ($) | Sep. 30, 2020 USD ($) | Jun. 30, 2021 USD ($) | Sep. 30, 2021 USD ($) | Sep. 30, 2020 USD ($) | Dec. 31, 2020 USD ($)
Operating Lease, Right-of-Use Asset, Amortization Expense |  |  |  | $ 231 | $ 324 |  | $ 760 | $ 977 |
Right-of-Use Asset Obtained in Exchange for Operating Lease Liability |  |  |  |  |  | $ 1,176 |  |  |
Incremental Sublease Income Above Impairment Charge |  | $ 350 |  |  |  |  |  |  |
EMS Segment Restructuring and Facility Consolidation [Member] |  |  |  |  |  |  |  |  |
Operating Lease, Impairment Loss |  |  |  |  |  |  |  |  | $ 522
Lease Facility in Fremont, California [Member] |  |  |  |  |  |  |  |  |
Area of Real Estate Property (Square Foot) | ft² | 3,888 |  |  |  |  |  |  |  |
Lessee, Operating Lease, Term of Contract (Month) | 38 months 15 days |  |  |  |  |  |  |  |
Right-of-Use Asset Obtained in Exchange for Operating Lease Liability | $ 202 |  |  |  |  |  | $ 202 |  |
Lease Agreement, EMS Facility in Mt. Laurel, New Jersey [Member] |  |  |  |  |  |  |  |  |
Right-of-Use Asset Obtained in Exchange for Operating Lease Liability |  |  | $ 2,051 |  |  |  |  |  |
Lessee, Operating Lease, Renewal Term (Month) |  |  | 120 months |  |  |  |  |  |

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- Definition Term of lessee's operating lease renewal, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=123408670&loc=SL77918673-209980 + Details
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