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Note 9 - Leases (Details Textual) € in Thousands, $ in Thousands | 3 Months Ended | 9 Months Ended |  |  |
--- | --- | --- | --- | --- | ---
Sep. 30, 2024 USD ($) ft² | Sep. 30, 2023 USD ($) | Sep. 30, 2024 USD ($) ft² | Sep. 30, 2023 USD ($) | Sep. 30, 2024 EUR (€) ft² | Mar. 12, 2024 USD ($) ft² | Mar. 12, 2024 EUR (€) ft² | Dec. 31, 2023 USD ($)
Operating Lease, Right-of-Use Asset, Periodic Reduction | $ 356 | $ 390 | $ 1,041 | $ 1,172 |  |  |  |
Operating Lease, Right-of-Use Asset | 11,292 |  | 11,292 |  |  |  |  | $ 4,987
Increase (Decrease) in Operating Lease Liability |  |  | (1,173) | (1,275) |  |  |  |
Operating Lease, Liability | 11,596 |  | 11,596 |  |  |  |  |
Building Leases in the U.S., the Netherlands and Singapore [Member] |  |  |  |  |  |  |  |
Operating Lease, Right-of-Use Asset | 5,623 |  | 5,623 |  |  |  |  |
Operating Lease, Liability | $ 5,623 |  | $ 5,623 |  |  |  |  |
Environmental Technologies in Germany [Member] |  |  |  |  |  |  |  |
Operating Lease, Right-of-Use Asset |  | $ 90 |  | $ 90 |  |  |  |
Lessee, Operating Lease, Term of Contract (Year) |  | 25 months |  | 25 months |  |  |  |
Process Technologies in Europe [Member] | Automobile Lease, One [Member] |  |  |  |  |  |  |  |
Lessee, Operating Lease, Term of Contract (Year) |  | 36 months |  | 36 months |  |  |  |
Process Technologies in Europe [Member] | Automobile Lease, Two [Member] |  |  |  |  |  |  |  |
Lessee, Operating Lease, Term of Contract (Year) |  | 48 months |  | 48 months |  |  |  |
Process Technologies in Europe [Member] | Automobile Leases [Member] |  |  |  |  |  |  |  |
Operating Lease, Right-of-Use Asset |  | $ 71 |  | $ 71 |  |  |  |
Operating Lease, Liability |  | $ 71 |  | $ 71 |  |  |  |
Alfamation [Member] |  |  |  |  |  |  |  |
Area of Real Estate Property (Square Foot) | ft² |  |  |  |  |  | 51,817 | 51,817 |
Annual Lease Payments |  |  |  |  |  | $ 284 | € 260 |
Lessee, Operating Lease, Term of Contract (Year) |  |  |  |  |  | 6 years | 6 years |
Alfamation [Member] | Warehouse and Office Space [Member] |  |  |  |  |  |  |  |
Area of Real Estate Property (Square Foot) | ft² | 51,817 |  | 51,817 |  | 51,817 |  |  |
Annual Lease Payments | € |  |  |  |  | € 260 |  |  |
Operating Lease, Right-of-Use Asset | $ 1,706 |  | $ 1,706 |  |  |  |  |
Increase (Decrease) in Operating Lease Liability |  |  | $ 1,706 |  |  |  |  |

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