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Note 3 - Restructuring and Other Charges (Details Textual) - USD ($) $ in Thousands |  | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
Dec. 28, 2020 | Dec. 31, 2020 | Sep. 30, 2020 | Jun. 30, 2020 | Mar. 31, 2020 | Sep. 30, 2019 | Jun. 30, 2019 | Jun. 30, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Operating Lease, Impairment Loss |  | $ 612 |  |  |  |  |  |  | $ 612 |
Operating Lease, Right-of-Use Asset |  | 6,387 |  |  |  |  |  |  | 6,387 | 4,842
Restructuring Charges, Total |  | 1,078 | $ 161 | $ 38 | $ 8 | $ 17 | $ 223 |  |  |
Lease Agreement, EMS Facility in Mt. Laurel, New Jersey [Member] |  |  |  |  |  |  |  |  |  |
Operating Lease, Right-of-Use Asset |  | 139 |  |  |  |  |  |  | 139 |
Severance and Other One-Time Termination Benefits [Member] |  |  |  |  |  |  |  |  |  |
Restructuring Charges, Total |  |  |  |  |  |  |  |  | 248 | 137
EMS Segment Restructuring and Facility Consolidation [Member] |  |  |  |  |  |  |  |  |  |
Restructuring and Related Costs, Incurred Cost, Total |  |  |  |  |  |  |  |  | 903 |
Operating Lease, Impairment Loss | $ 522 |  |  |  |  |  |  |  | 522 |
Operating Lease, Right-of-Use Asset |  | 597 |  |  |  |  |  |  | 597 |
Other Restructuring Costs |  |  |  |  |  |  |  |  | 159 |
EMS Segment Restructuring and Facility Consolidation [Member] | Minimum [Member] | Forecast [Member] |  |  |  |  |  |  |  |  |  |
Restructuring and Related Costs, Incurred Cost, Total |  |  |  |  |  |  |  | $ 100 |  |
EMS Segment Restructuring and Facility Consolidation [Member] | Maximum [Member] | Forecast [Member] |  |  |  |  |  |  |  |  |  |
Restructuring and Related Costs, Incurred Cost, Total |  |  |  |  |  |  |  | $ 150 |  |
Executive Management Changes [Member] |  |  |  |  |  |  |  |  |  |
Operating Lease, Impairment Loss |  | $ 90 |  |  |  |  |  |  | 90 |
Restructuring Charges, Total |  |  |  |  |  |  |  |  | 514 |
Share-based Payment Arrangement, Reversal of Expense |  |  |  |  |  |  |  |  | 117 |
Other Restructuring Costs |  |  |  |  |  |  |  |  | 381 |
Executive Management Changes [Member] | Facility Size Reduction [Member] |  |  |  |  |  |  |  |  |  |
Other Restructuring Costs |  |  |  |  |  |  |  |  | 99 |
Other Restructuring Actions [Member] | Headcount Reductions and Employee Relocation [Member] |  |  |  |  |  |  |  |  |  |
Other Restructuring Costs |  |  |  |  |  |  |  |  | 46 |
Other Restructuring Actions [Member] | Employee Relocation [Member] |  |  |  |  |  |  |  |  |  |
Other Restructuring Costs |  |  |  |  |  |  |  |  | $ 14 |
Ambrell European Operations Consolidation [Member] |  |  |  |  |  |  |  |  |  |
Restructuring Charges, Total |  |  |  |  |  |  |  |  |  | 240
Ambrell European Operations Consolidation [Member] | Severance and Other One-Time Termination Benefits [Member] |  |  |  |  |  |  |  |  |  |
Restructuring Charges, Total |  |  |  |  |  |  |  |  |  | 137
Ambrell European Operations Consolidation [Member] | Facility Closing [Member] |  |  |  |  |  |  |  |  |  |
Restructuring Charges, Total |  |  |  |  |  |  |  |  |  | $ 103

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