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Note 9 - Commitments and Contingencies (Details Textual) - USD ($) | 1 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 30, 2018 | Dec. 31, 2023 | Dec. 31, 2022
Payments for Reimbursement of Filtration and Maintenance |  | $ 22,000 | $ 21,000
Notice and Finding of Violation and Order [Member] |  |  |
Loss Contingency, Damages Sought, Value | $ 230,000 |  |

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- Definition Cash payments made for reimbursement of filtration and maintenance. + References No definition available. + Details
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Balance Type: | credit
Period Type: | duration

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- Definition The value (monetary amount) of the award the plaintiff seeks in the legal matter. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 450 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Publisher FASB -URI https://asc.fasb.org//1943274/2147483076/450-20-50-1 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 450 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 4 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org//1943274/2147483076/450-20-50-4 Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 450 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 9 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org//1943274/2147483076/450-20-50-9 + Details
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- Details
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Period Type: |