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Note 8 - Leases (Details Textual) $ in Thousands |  |  | 3 Months Ended | 9 Months Ended | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | ---
Oct. 01, 2020 USD ($) | Apr. 08, 2019 USD ($) ft² | Dec. 31, 2020 USD ($) | Sep. 30, 2019 USD ($) | Sep. 30, 2020 USD ($) | Sep. 30, 2019 USD ($) | Dec. 31, 2020 USD ($) | Dec. 31, 2019 USD ($) | Sep. 22, 2020 ft² | Jan. 23, 2020 | Mar. 31, 2019
Operating Lease, Right-of-Use Asset, Amortization Expense |  |  |  |  |  |  | $ 1,294 | $ 1,251 |  |  |
Operating Lease, Impairment Loss |  |  | $ 612 |  |  |  | 612 |  |  |  |
Mansfield, Massachusetts [Member] |  |  |  |  |  |  |  |  |  |  |
Lessee, Operating Lease, Renewal Term (Month) |  | 3 years 120 days |  |  |  |  |  |  |  |  |
Increase in Operating Lease Liabilities and Right-of-Use Assets, Non-cash |  | $ 1,811 |  |  |  |  |  |  |  |  |
Operating Lease, Increase in Area (Square Foot) | ft² |  | 6,100 |  |  |  |  |  |  |  |  |
Lease Agreement, EMS Facility in Fremont, California [Member] |  |  |  |  |  |  |  |  |  |  |
Lessee, Operating Lease, Renewal Term (Month) |  |  |  |  |  |  |  |  |  | 5 years 30 days |
Increase in Operating Lease Liabilities and Right-of-Use Assets, Non-cash |  |  |  |  | $ 1,176 |  | 1,176 |  |  |  |
Lease Agreement, EMS Facility in Mt. Laurel, New Jersey [Member] |  |  |  |  |  |  |  |  |  |  |
Lessee, Operating Lease, Renewal Term (Month) |  |  |  |  |  |  |  |  | 10 years |  |
Increase in Operating Lease Liabilities and Right-of-Use Assets, Non-cash |  |  |  |  |  |  | 2,051 |  |  |  |
Area of Real Estate Property (Square Foot) | ft² |  |  |  |  |  |  |  |  | 33,650 |  |
Lease Agreement, Ambrell’s Netherlands Facility [Member] |  |  |  |  |  |  |  |  |  |  |
Lessee, Operating Lease, Renewal Term (Month) | 3 years |  |  |  |  |  |  |  |  |  |
Increase in Operating Lease Liabilities and Right-of-Use Assets, Non-cash | $ 133 |  |  |  |  |  | 133 |  |  |  |
Decrease In Operating Lease Liabilities and Right-of-Use Assets, Non-cash |  |  |  | $ 48 |  |  |  | 48 |  |  |
Automobile Leases [Member] |  |  |  |  |  |  |  |  |  |  |
Increase in Operating Lease Liabilities and Right-of-Use Assets, Non-cash |  |  | $ 91 |  |  |  | $ 91 |  |  |  |
Lease Agreement, Ambrell’s U.K [Member] |  |  |  |  |  |  |  |  |  |  |
Lessee, Operating Lease, Term of Contract (Year) |  |  |  |  |  |  |  |  |  |  | 15 years
Decrease In Operating Lease Liabilities and Right-of-Use Assets, Non-cash |  |  |  |  |  | $ 486 |  | $ 486 |  |  |

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