Note 4 - Lines of Credit	6 Months Ended
Jun. 30, 2020
Notes to Financial Statements
Debt Disclosure [Text Block]	NOTE 4 - LINES OF CREDIT In connection with certain orders, we provide the customer a working guarantee, a prepayment guarantee or security bond. For that purpose, we have a guarantee credit line of DKK10,000,000 (approximately $1,500,000). The credit line is secured by a cash deposit of $2,700,000. Further, we have a guarantee for a specific project delivered in 2016 of DKK 94,620 (approximately $14,217 at June 30, 2020) with a bank, subject to certain base limitations. This line of credit is guaranteed by Vækstfonden (the Danish state's investments fund) and is secured by certain assets of LiqTech Systems such as receivables, inventory, and equipment.

The entire disclosure for information about short-term and long-term debt arrangements, which includes amounts of borrowings under each line of credit, note payable, commercial paper issue, bonds indenture, debenture issue, own-share lending arrangements and any other contractual agreement to repay funds, and about the underlying arrangements, rationale for a classification as long-term, including repayment terms, interest rates, collateral provided, restrictions on use of assets and activities, whether or not in compliance with debt covenants, and other matters important to users of the financial statements, such as the effects of refinancing and noncompliance with debt covenants.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 470
-URI http://asc.fasb.org/topic&trid=2208564

Name:	us-gaap_DebtDisclosureTextBlock
Namespace Prefix:	us-gaap_
Data Type:	nonnum:textBlockItemType
Balance Type:	na
Period Type:	duration