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Note 7 - Agreements, Commitments and Contingencies (Details Textual) |  |  | 12 Months Ended
--- | --- | --- | ---
Feb. 27, 2019 USD ($) | Feb. 27, 2019 DKK (kr) | Nov. 20, 2018 USD ($) | Nov. 20, 2018 DKK (kr) | Dec. 31, 2019 USD ($) | Dec. 31, 2018 USD ($)
Defined Contribution Plan, Cost |  |  |  |  | $ 10,283 | $ 11,310
Warranty Accrual, Percent |  |  |  |  | 3.00% | 7.00%
Purchase Obligation, Total |  |  |  |  | $ 3,800,000 |
Minimum [Member] |  |  |  |  |  |
Standard Product Warranty, Term |  |  |  |  | 1 year |
Maximum [Member] |  |  |  |  |  |
Standard Product Warranty, Term |  |  |  |  | 3 years |
Extended Product Warranty, Term |  |  |  |  | 4 years |
LiqTech International AS [Member] | Claim with Former Supplier for Breach of Agreement [Member] |  |  |  |  |  |
Loss Contingency, Damages Sought, Value |  |  | $ 68,800 | kr 448,500 |  |
LiqTech International AS [Member] | Claim with Former Supplier for Services Rendered [Member] |  |  |  |  |  |
Loss Contingency, Damages Sought, Value | $ 83,400 | kr 543,905 |  |  |  |

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- Definition The period for the extended product warranty, in PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details
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- Definition Amount of cost for defined contribution plan. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 70 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=49170846&loc=d3e28014-114942 + Details
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- Definition The value (monetary amount) of the award the plaintiff seeks in the legal matter. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 450 -SubTopic 20 -Section 50 -Paragraph 9 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=118942415&loc=d3e14557-108349 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 450 -SubTopic 20 -Section 50 -Paragraph 4 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=118942415&loc=d3e14435-108349 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 450 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=118942415&loc=d3e14326-108349 + Details
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