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Note 8 - Leases - Lease Modifications (Details) - USD ($) $ in Thousands | Dec. 31, 2023 | Mar. 31, 2023 | Dec. 31, 2022 | Sep. 30, 2022 | Mar. 31, 2022
--- | --- | --- | --- | --- | ---
Total | $ 5,422 |  |  |  |
Operating Lease, Right-of-Use Asset | 4,987 |  | $ 5,770 |  |
Environmental Technologies in Germany [Member] |  |  |  |  |
Total | 90 | $ 90 |  |  |
Operating Lease, Right-of-Use Asset | 90 | $ 90 |  |  |
Lease Facility in Singapore [Member] |  |  |  |  |
Total |  |  | 51 |  | $ 51
Operating Lease, Right-of-Use Asset |  |  | 51 |  | $ 51
Automobile Lease, One [Member] |  |  |  |  |
Total | 30 |  |  |  |
Operating Lease, Right-of-Use Asset | 30 |  |  |  |
Automobile Lease for Videology [Member] |  |  |  |  |
Total |  |  | 42 | $ 42 |
Operating Lease, Right-of-Use Asset |  |  | 42 | $ 42 |
Automobile Lease, Two [Member] |  |  |  |  |
Total | 41 |  |  |  |
Operating Lease, Right-of-Use Asset | 41 |  |  |  |
Facility for Acculogic Operation in Canada [Member] |  |  |  |  |
Total |  |  | 942 |  |
Operating Lease, Right-of-Use Asset |  |  | 942 |  |
Southeast Asia Operation [Member] |  |  |  |  |
Total | 455 |  |  |  |
Operating Lease, Right-of-Use Asset | 455 |  |  |  |
Facility for Acculogic Operation in California [Member] |  |  |  |  |
Total |  |  | 127 |  |
Operating Lease, Right-of-Use Asset |  |  | $ 127 |  |
Process Technologies in the Netherlands [Member] |  |  |  |  |
Total | 136 |  |  |  |
Operating Lease, Right-of-Use Asset | $ 136 |  |  |  |

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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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