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Note 8 - Leases (Details Textual) - USD ($) $ in Thousands | 12 Months Ended |  |  |  |
--- | --- | --- | --- | --- | ---
Dec. 31, 2023 | Dec. 31, 2022 | Jun. 30, 2023 | Mar. 31, 2023 | Sep. 30, 2022 | Mar. 31, 2022
Operating Lease, Right-of-Use Asset, Amortization Expense | $ 1,567 | $ 1,241 |  |  |  |
Operating Lease, Right-of-Use Asset | 4,987 | 5,770 |  |  |  |
Operating Lease, Liability | 5,422 |  |  |  |  |
Environmental Technologies in Germany [Member] |  |  |  |  |  |
Lessee, Operating Lease, Term of Contract (Month) |  |  |  | 25 months |  |
Operating Lease, Right-of-Use Asset | 90 |  |  | $ 90 |  |
Operating Lease, Liability | $ 90 |  |  | $ 90 |  |
Process Technologies in Europe [Member] | Automobile Lease, One [Member] |  |  |  |  |  |
Lessee, Operating Lease, Term of Contract (Month) |  |  |  | 36 years |  |
Process Technologies in Europe [Member] | Automobile Leases [Member] |  |  |  |  |  |
Operating Lease, Right-of-Use Asset |  |  | $ 41 | $ 30 |  |
Operating Lease, Liability |  |  | $ 41 | $ 30 |  |
Process Technologies in Europe [Member] | Automobile Lease, Two [Member] |  |  |  |  |  |
Lessee, Operating Lease, Term of Contract (Month) |  |  | 48 years |  |  |
Southeast Asia Operation [Member] |  |  |  |  |  |
Lessee, Operating Lease, Term of Contract (Month) | 36 months |  |  |  |  |
Operating Lease, Right-of-Use Asset | $ 455 |  |  |  |  |
Operating Lease, Liability | $ 455 |  |  |  |  |
Process Technologies in the Netherlands [Member] |  |  |  |  |  |
Lessee, Operating Lease, Term of Contract (Month) | 36 years |  |  |  |  |
Operating Lease, Right-of-Use Asset | $ 136 |  |  |  |  |
Operating Lease, Liability | $ 136 |  |  |  |  |
Lease Facility in Singapore [Member] |  |  |  |  |  |
Operating Lease, Right-of-Use Asset |  | 51 |  |  |  | $ 51
Operating Lease, Liability |  | 51 |  |  |  | $ 51
Automobile Lease for Videology [Member] |  |  |  |  |  |
Lessee, Operating Lease, Term of Contract (Month) |  |  |  |  | 48 months |
Operating Lease, Right-of-Use Asset |  | 42 |  |  | $ 42 |
Operating Lease, Liability |  | $ 42 |  |  | $ 42 |
Facility for Acculogic Operation in Canada [Member] |  |  |  |  |  |
Lessee, Operating Lease, Term of Contract (Month) |  | 62 months |  |  |  |
Operating Lease, Right-of-Use Asset |  | $ 942 |  |  |  |
Operating Lease, Liability |  | $ 942 |  |  |  |
Facility for Acculogic Operation in California [Member] |  |  |  |  |  |
Lessee, Operating Lease, Term of Contract (Month) |  | 37 months |  |  |  |
Operating Lease, Right-of-Use Asset |  | $ 127 |  |  |  |
Operating Lease, Liability |  | $ 127 |  |  |  |

X
- Definition Term of lessee's operating lease, 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 -Topic 842 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 3 -Subparagraph (a)(3) -Publisher FASB -URI https://asc.fasb.org//1943274/2147478964/842-20-50-3 + Details
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- Definition Present value of lessee's discounted obligation for lease payments from operating lease. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 842 -SubTopic 20 -Name Accounting Standards Codification -Section 45 -Paragraph 1 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org//1943274/2147479041/842-20-45-1 + Details
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- Definition Amount of lessee's right to use underlying asset under operating lease. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 842 -SubTopic 20 -Name Accounting Standards Codification -Section 45 -Paragraph 1 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org//1943274/2147479041/842-20-45-1 + Details
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- Definition Amount of periodic reduction over lease term of carrying amount of right-of-use asset from operating lease. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 230 -SubTopic 10 -Name Accounting Standards Codification -Section 45 -Paragraph 28 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482740/230-10-45-28 + Details
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