LiqTech International (LIQT) 10-K 22 Mar 24 2023 FY Annual report Financial data

Document And Entity Information

Document And Entity Information - USD ($)	12 Months Ended
	Dec. 31, 2023	Mar. 21, 2024	Jun. 30, 2023
Document Information [Line Items]
Entity Central Index Key	0001307579
Entity Registrant Name	LIQTECH INTERNATIONAL INC
Amendment Flag	false
Current Fiscal Year End Date	--12-31
Document Fiscal Period Focus	FY
Document Fiscal Year Focus	2023
Document Type	10-K
Document Annual Report	true
Document Period End Date	Dec. 31, 2023
Document Transition Report	false
Entity File Number	001-36210
Entity Incorporation, State or Country Code	NV
Entity Tax Identification Number	20-1431677
Entity Address, Address Line One	Industriparken 22C
Entity Address, Postal Zip Code	DK 2750
Entity Address, City or Town	Ballerup
Entity Address, Country	DK
City Area Code	453
Local Phone Number	1315941
Title of 12(b) Security	Common Stock, $0.001 par value
Trading Symbol	LIQT
Security Exchange Name	NASDAQ
Entity Well-known Seasoned Issuer	No
Entity Voluntary Filers	No
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Non-accelerated Filer
Entity Small Business	true
Entity Emerging Growth Company	false
ICFR Auditor Attestation Flag	false
Document Financial Statement Error Correction [Flag]	false
Entity Shell Company	false
Entity Public Float			$ 16,158,560
Entity Common Stock, Shares Outstanding		5,807,340
Auditor Firm ID	3627
Auditor Name	Sadler, Gibb & Associates, LLC
Auditor Location	Draper, UT

Consolidated Balance Sheets

Consolidated Balance Sheets - USD ($)	Dec. 31, 2023	Dec. 31, 2022
Current Assets:
Cash, cash equivalents and restricted cash	$ 10,422,181	$ 16,597,371
Accounts receivable, net of allowance for doubtful accounts of $134,912 and $59,559 at December 31, 2023 and December 31, 2022, respectively	3,171,047	2,310,344
Inventories, net of allowance for excess and obsolete inventory of $867,458 and $663,227 at December 31, 2023 and December 31, 2022, respectively	5,267,816	4,062,001
Contract assets	2,891,744	2,253,295
Prepaid expenses and other current assets	337,391	1,720,902
Assets held for sale	0	723,872
Total Current Assets	22,090,179	27,667,785
Long-Term Assets:
Property and equipment, net of accumulated depreciation of $11,828,200 and $9,046,499 at December 31, 2023 and December 31, 2022, respectively	9,007,166	8,296,807
Operating lease right-of-use assets	4,055,837	3,271,997
Deposits and other assets	470,349	450,038
Intangible assets, net of accumulated amortization of $558,555 and $438,250 at December 31, 2023 and December 31, 2022, respectively	114,593	212,933
Goodwill	233,723	226,095
Total Long-term Assets	13,881,668	12,457,870
Total Assets	35,971,847	40,125,655
Current Liabilities:
Accounts payable	2,444,653	1,389,355
Accrued expenses	3,550,542	3,087,206
Current portion of finance lease obligations	590,550	399,198
Current portion of operating lease liabilities	531,355	561,182
Contract liabilities	382,647	649,557
Total Current Liabilities	7,499,747	6,086,498
Deferred tax liability	101,059	154,645
Finance lease obligation, net of current portion	2,879,932	2,384,011
Operating lease liability, net of current portion	3,527,082	2,710,815
Senior promissory notes payable	4,688,011	5,480,314
Total Long-term liabilities	11,196,084	10,729,785
Total Liabilities	18,695,831	16,816,283
Stockholders' Equity:
Preferred stock; par value $0.001, 2,500,000 shares authorized, 0 shares issued and outstanding at December 31, 2022 and December 31, 2021	0	0
Common stock; par value $0.001, 50,000,000 shares authorized 5,727,310 and 5,498,260 shares issued and outstanding at December 31, 2023 and December 31, 2022, respectively	5,727	5,498
Additional paid-in capital	98,796,357	96,975,476
Accumulated deficit	(75,922,180)	(67,351,035)
Accumulated other comprehensive loss	(5,603,888)	(6,320,567)
Total Stockholders' Equity	17,276,016	23,309,372
Total Liabilities and Stockholders' Equity	$ 35,971,847	$ 40,125,655

Consolidated Balance Sheets (Pa

Consolidated Balance Sheets (Parentheticals) - USD ($)	Dec. 31, 2023	Dec. 31, 2022
Accounts receivable, allowance for doubtful accounts	$ 134,912	$ 59,559
Inventories, allowance for excess and obsolete inventory	867,458	663,227
Property and equipment, accumulated depreciation	11,828,200	9,046,499
Intangible assets, accumulated depreciations	$ 558,555	$ 438,250
Preferred stock, par value (in dollars per share)	$ 0.001	$ 0.001
Preferred stock, authorized (in shares)	2,500,000	2,500,000
Preferred stock, issued (in shares)	0	0
Common stock, par value (in dollars per share)	$ 0.001	$ 0.001
Common stock, authorized (in shares)	50,000,000	50,000,000
Common stock, issued (in shares)	5,727,310	5,498,260
Common stock, outstanding (in shares)	5,727,310	5,498,260

Consolidated Statements of Oper

Consolidated Statements of Operations - USD ($)	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Revenue	$ 18,001,652	$ 15,982,438
Cost of Goods Sold	15,226,176	15,415,294
Gross Profit	2,775,476	567,144
Operating Expenses:
Selling expenses	4,298,905	3,669,887
General and administrative expenses	4,856,779	5,701,955
Research and development expenses	1,418,842	1,835,890
Restructuring costs	0	1,893,166
Total Operating Expenses	10,574,526	13,100,898
Loss from Operations	(7,799,050)	(12,533,754)
Other Income (Expense)
Interest and other income	366,365	384,058
Interest expense	(151,670)	(419,942)
Amortization of discount on convertible note	(400,903)	(2,389,128)
Gain (loss) on currency transactions	(359,960)	404,162
Gain on lease termination	0	147,452
Gain (loss) on disposal of assets held for sale	(439,388)	0
Gain on sale of property and equipment	7,254	635
Total Other Expense	(978,302)	(1,872,763)
Loss Before Income Taxes	(8,777,352)	(14,406,517)
Income Tax Benefit	(206,207)	(237,410)
Net Loss	$ (8,571,145)	$ (14,169,107)
Basic and Diluted Loss Per Share (in dollars per share)	$ (1.51)	$ (3.2)
Basic and Diluted Weighted Average Common Shares Outstanding (in shares)	5,688,281	4,424,433

Consolidated Statements of Comp

Consolidated Statements of Comprehensive Loss - USD ($)	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Net Loss for the year ended December 31, 2023	$ (8,571,145)	$ (14,169,107)
Other Comprehensive Income (Loss) - Currency Translation, net	716,679	(1,345,168)
Total Comprehensive Loss	$ (7,854,466)	$ (15,514,275)

Consolidated Statement of Stock

Consolidated Statement of Stockholders' Equity - USD ($)	Common Stock [Member]	Additional Paid-in Capital [Member]	Retained Earnings [Member]	AOCI Attributable to Parent [Member]	Total
BALANCE (in shares) at Dec. 31, 2021	2,660,713
BALANCE at Dec. 31, 2021	$ 2,661	$ 70,929,526	$ (53,181,928)	$ (4,975,399)	$ 12,774,860
Common stock issued in settlement of RSUs (in shares)	20,566
Common stock issued in settlement of RSUs	$ 20	(20)
Warrants issued in connection with Senior Promissory Notes		660,836			660,836
Stock-based compensation		934,423			934,423
Currency translation, net				(1,345,168)	(1,345,168)
Net Loss for the year ended December 31, 2023			(14,169,107)		(14,169,107)
Common shares issued for cash at $0.50 per share, net of offering cost of $1,996,469, in May 2022 (in shares)	2,816,981
Common shares issued for cash at $0.50 per share, net of offering cost of $1,996,469, in May 2022	$ 2,817	24,450,711			24,453,528
BALANCE (in shares) at Dec. 31, 2022	5,498,260
BALANCE at Dec. 31, 2022	$ 5,498	96,975,476	(67,351,035)	(6,320,567)	23,309,372
Common stock issued in settlement of RSUs (in shares)	212,254
Common stock issued in settlement of RSUs	$ 212	(212)
Fractional shares from individual shareholder round-up following reverse split (in shares)	16,796
Fractional shares from individual shareholder round-up following reverse split	$ 17	(17)
Warrants issued in connection with Senior Promissory Notes		1,193,206			1,193,206
Stock-based compensation		627,904			627,904
Currency translation, net				716,679	716,679
Net Loss for the year ended December 31, 2023			(8,571,145)		(8,571,145)
BALANCE (in shares) at Dec. 31, 2023	5,727,310
BALANCE at Dec. 31, 2023	$ 5,727	$ 98,796,357	$ (75,922,180)	$ (5,603,888)	$ 17,276,016

Consolidated Statement of Sto_2

Consolidated Statement of Stockholders' Equity (Parentheticals)	12 Months Ended
	Dec. 31, 2022 USD ($) $ / shares
Shares issued, offering cost | $	$ 1,996,469
Shares issued, offering cost per share (in dollars per share) | $ / shares	$ 0.5

Consolidated Statements of Cash

Consolidated Statements of Cash Flows - USD ($)	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Cash Flows from Operating Activities:
Net Income (Loss)	$ (8,571,145)	$ (14,169,107)
Adjustments to reconcile net loss to net cash used in operations:
Depreciation and amortization	3,140,779	2,585,881
Amortization of discount on convertible notes payable	400,903	2,389,128
Stock-based compensation	627,904	934,423
Change in deferred tax liability	(57,539)	(55,994)
Gain on lease termination	0	(147,452)
Loss on disposal of assets held for sale	439,388	0
Gain on sale of equipment	(7,254)	(635)
Changes in assets and liabilities:
Accounts receivable	(765,956)	(460,837)
Inventory	(1,045,838)	984,130
Contract assets	(825,974)	(460,743)
Prepaid expenses and other current assets	1,403,707	(354,307)
Accounts payable	990,538	(158,797)
Accrued expenses	639,309	(1,632,897)
Operating lease liabilities	(562,948)	(544,391)
Contract liabilities	(282,614)	(234,873)
Assets held for sale	292,822	(712,549)
Net Cash used in Operating Activities	(4,183,918)	(12,039,020)
Cash Flows from Investing Activities:
Purchase of property and equipment	(2,893,290)	(1,690,621)
Proceeds from sale of property and equipment	7,254	635
Net Cash used in Investing Activities	(2,886,036)	(1,689,986)
Cash Flows from Financing Activities:
Payments on finance lease obligation	(435,343)	77,939
Proceeds from Sale and Leaseback Agreements	1,015,988	0
Payments on Convertible Note	0	(16,800,000)
Proceeds from issuance of common stock and prefunded warrants	0	24,418,612
Proceeds from issuance of Senior Promissory Notes	0	6,000,000
Net Cash Provided by Financing Activities	580,645	13,696,551
Effect of foreign currency exchange on cash	314,119	(859,554)
Net Change in Cash, Cash Equivalents and Restricted Cash	(6,175,190)	(892,009)
Cash, Cash Equivalents and Restricted Cash at Beginning of Period	16,597,371	17,489,380
Cash, Cash Equivalents and Restricted Cash at End of Period	10,422,181	16,597,371
Supplemental Disclosures of Cash Flow Information:
Interest	178,872	348,575
Income Taxes	0	0
Non-cash financing activities
Debt discount on Senior Promissory Notes	$ 1,193,206	$ 695,749

Note 1 - Summary of Significant

Note 1 - Summary of Significant Accounting Policies	12 Months Ended
	Dec. 31, 2023
Notes to Financial Statements
Significant Accounting Policies [Text Block]	NOTE 1 ORGANIZATION AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES Business and Basis of Presentation The consolidated financial statements include the accounts of LiqTech International, Inc. and its subsidiaries (the “Company”). The terms "Company", “us", "we" and "our" as used in this report refer to the Company and its subsidiaries, which are set forth below. The Company engages in the development, design, production, marketing, and sale of automated filtering systems, ceramic silicon carbide liquid applications, and diesel particulate air filters in the Americas, Asia-Pacific, Europe, and Middle-East & Africa. Set forth below is a description of the Company and each of its subsidiaries: LiqTech International, Inc., a Nevada corporation organized in July 2004, LiqTech USA Inc., a Delaware corporation and a 100% owned subsidiary of the Company formed in May 2011. LiqTech Holding A/S (formerly known as LiqTech International A/S), a Danish corporation, incorporated on January 15, 2000 ( LiqTech NA, Inc. (“LiqTech NA”), incorporated in Delaware on July 1, 2005, January 2021, LiqTech Water A/S (formerly known as LiqTech Systems A/S), a Danish corporation (“LiqTech Water”), incorporated on September 1, 2009, LiqTech Plastics A/S (formerly known as BS Plastic A/S), a Danish corporation (“LiqTech Plastics”), acquired on September 1, 2019, LiqTech Ceramics A/S, a Danish corporation (“LiqTech Ceramics”), incorporated on December 20, 2019, LiqTech Water Projects A/S, a Danish corporation (“LiqTech Water Projects”), incorporated on July 28, 2020, LiqTech Emission Control A/S, a Danish corporation (“LiqTech Emission Control”), incorporated on March 1, 2021, LiqTech Environment Technologies (China) Co. Ltd. (“LiqTech China”), incorporated on September 23, 2021, Consolidation -- Reverse Stock Split -- May 26, 2023, 1 1 8 1 8 As a result of the reverse Common Stock split, an amount equal to the decreased value of Common Stock was reclassified from “Common Stock” to “Additional Paid-in Capital.” Functional Currency / Foreign currency translation -- twelve December 31, 2023 2022. Cash, Cash Equivalents, and Restricted Cash -- three December 31, 2023, 2022, Accounts held in each U.S. institution are insured by the Federal Deposit Insurance Company (“FDIC”) up to $250,000. December 31, 2023 December 31, 2022, Accounts Receivable -- 326, The roll-forward of the allowance for doubtful accounts as of December 31, 2023 December 31, 2022 2023 2022 Allowance for doubtful accounts at the beginning of the period $ 59,559 $ 409,076 Bad debt expense 82,066 (24,534 ) Receivables written off during the periods (10,298 ) (295,778 ) Effect of currency translation 3,585 (29,205 ) Allowance for doubtful accounts at the end of the period $ 134,912 $ 59,559 Inventory first first For inventory produced, standard costs that approximate actual cost on the FIFO method are used to value inventory. Standard costs are reviewed at least annually by management or more often in the event that circumstances indicate a change in cost has occurred. Work in process and finished goods include material, labor, and production overhead costs. The Company adjusts the value of its inventory to the extent management determines that the cost cannot be recovered due to obsolescence or other factors. Inventory valuation adjustments for excess and obsolete inventory are calculated based on current inventory levels, movement, expected useful lives, and estimated future demand for our products. Contracts Assets / Liabilities not Contract assets also include unbilled receivables, which usually comprise the last invoice remaining after the delivery of the water treatment unit, where revenue is recognized at the transfer of control based upon signed acceptance of the unit by the customer. Most commonly, this invoice is sent to the customer at commissioning of the product or no 12 Assets Held for Sale 1 2 3 4 one 5 6 Leases -- not 12 not not may Property and Equipment -- three ten Long-lived Assets may not not Impairments of long-lived assets are determined for groups of assets related to the lowest level of identifiable independent cash flows. Due to the Company’s asset usage model and the interchangeable nature of its ceramic filter manufacturing capacity, the Company must make subjective judgments in determining the independent cash flows that can be related to specific asset groupings. In addition, as the Company makes manufacturing process changes and other factory planning decisions, it must make subjective judgments regarding the remaining useful lives of assets, primarily process-specific filter manufacturing tools and building improvements. If the Company determines that the useful lives of assets are shorter than it had originally estimated, the Company accelerates the rate of depreciation over the assets’ new, shorter useful lives. Management has analyzed the impact of the current economic climate on its financial statements as of December 31, 2023, not December 31, 2023 2022, Goodwill and Intangible Assets -- not Acquired intangible assets with determinable useful lives are amortized on a straight-line or accelerated basis over the estimated periods benefited, ranging from one ten five The Company evaluates the recoverability of long-lived assets by comparing the carrying amount of an asset to estimated future net undiscounted cash flows generated by the asset. If such assets are considered to be impaired, the impairment recognized is measured as the amount by which the carrying value of the assets exceeds the fair value of the assets. The evaluation of recoverability involves estimates of future operating cash flows based upon certain forecasted assumptions, including, but not Goodwill is not Revenue Recognition 606, five 1 2 3 4 5 The Company sells products throughout the world; sales by geographical region are as follows for the year ended December 31, 2023 2022: % Distribution For the Year Ended December 31 2023 2022 2023 2022 Americas 12 % 7 % $ 2,125,460 $ 1,073,433 Asia-Pacific 14 % 21 % 2,506,215 3,406,420 Europe 65 % 59 % 11,820,674 9,379,337 Middle East & Africa 9 % 13 % 1,549,303 2,123,248 100 % 100 % $ 18,001,652 $ 15,982,438 The Company’s sales by product line are as follows for the years ended December 31, 2023 2022: % Distribution For the Year Ended December 31 2023 2022 2023 2022 Water 42 % 33 % $ 7,705,080 $ 5,297,286 Ceramics 35 % 43 % 6,232,628 6,844,861 Plastics 21 % 22 % 3,736,529 3,528,606 Corporate 2 % 2 % 327,415 311,685 100 % 100 % $ 18,001,652 $ 15,982,438 For Water (systems and aftermarket), Ceramics (diesel particulate filters and membranes), and Plastics (components), revenue is recognized when performance obligations specified within the terms of a contract with the customer are satisfied, which occurs when control of the product transfers to the customer or when services are rendered by the Company. The majority of the Company's sales contracts contain performance obligations satisfied at a point in time when title along with risks and rewards of ownership have transferred to the customer. This generally occurs when the product is shipped or accepted by the customer. Revenue for service contracts is recognized as the services are provided. Revenue is measured as the amount of consideration expected to be received in exchange for transferring the goods or providing services. The satisfaction of performance obligations under the terms of a revenue contract generally gives rise to the right to receive payment from the customer. The Company's standard payment terms vary by the type and location of the customer and the products or services offered. Generally, the time between when revenue is recognized and when payment is due is not not For contracts with customers that include multiple performance obligations, judgment is required to determine whether performance obligations specified in these contracts are distinct and should be accounted for as separate revenue transactions for recognition purposes. For such arrangements, revenue is allocated to each performance obligation based on its relative standalone selling price. Standalone selling prices are generally determined based on the prices charged to customers or using an expected cost-plus margin. System sales are recognized when the Company transfers control to the customer based upon sales and delivery conditions specified in the sales contract. This typically occurs upon shipment of the system from the production facility but can also occur upon other agreed delivery terms. In connection with the completion of the system, it is normal procedure to issue a Factory Acceptance Test (“FAT”) asserting that the customer has accepted the performance of the system as it is being shipped from our production facility in Hobro. As part of the performance obligation, the customer is normally offered commissioning services (final assembly and configuration at a place designated by the customer), and this commissioning is therefore considered a second second first Aftermarket sales represent parts, extended warranties, and maintenance services. For the sale of aftermarket parts, the Company transfers control and recognizes revenue when parts are shipped to the customer. When customers are given the right to return eligible parts and accessories, the Company estimates the expected returns based on an analysis of historical experience. The Company adjusts estimated revenues at the earlier of when the most likely amount of consideration expected to be received changes or when the consideration becomes fixed. The Company recognizes revenue for extended warranty and maintenance agreements based on the standalone selling price over the life of the contract. The Company has received long-term contracts for grants from government entities for the development and use of silicon carbide membranes in various water filtration and treatment applications and historically in the installation of various water filtration systems. We measure the transfer of control of the performance obligation on long-term contracts utilizing the cost-to-cost measure of progress, with cost of revenue including direct costs such as labor and materials. Under the cost-to-cost approach, the use of estimated costs to complete each performance obligation is a significant variable in the process of determining recognized revenue and a significant factor in the accounting for such performance obligations. The timing of when we bill our customers is generally dependent upon advance billings terms, milestone billings based on completion of certain phases of the work, or when services are provided or products are shipped. Projects with performance obligations recognized over time that have costs and estimated earnings recognized to date in excess of cumulative billings are reported on our balance sheet as Contract assets. Projects with performance obligations recognized over time that have cumulative billings in excess of costs and estimated earnings recognized to date are reported on our balance sheet as Contract liabilities. The roll-forward of Contract Assets/Liabilities for the year ended December 31, 2023 December 31, 2022 2023 2022 Cost incurred $ 3,225,728 $ 3,860,179 Unbilled project deliveries 582,557 950,105 VAT 329,980 229,006 Other receivables 92,619 45,814 Prepayments (1,688,427 ) (3,363,039 ) Deferred Revenue (33,360 ) (118,327 ) $ 2,509,097 $ 1,603,738 Distributed as follows: Contract assets $ 2,891,744 $ 2,253,295 Contract liabilities (382,647 ) (649,557 ) $ 2,509,097 $ 1,603,738 Cost of Sales -- Advertising Cost -- December 31, 2023 2022, Research and Development Cost -- December 31, 2023 2022 Income Taxes -- 740: Loss Contingencies may Income/(Loss) Per Share -- 260, not Stock Awards -- 718, December 31, 2023 2022, Fair Value of Financial Instruments -- 820. three ● Level 1. ● Level 2. ● Level 3. no Unless otherwise disclosed, the fair value of the Company’s financial instruments including cash, accounts receivable, other receivables, prepaid expenses, accounts payable, and accrued expenses approximate their recorded values due to their short-term maturities. Accounting Estimates -- Recent Accounting Pronouncements -- December 2023, 2023 09, 740 1 2 2023 09 December 15, 2025, In November 2023, 2023 07, 280 2023 07 December 15, 2023, December 15, 2024, In August 2023, 2023 05, 805 60 2023 05 January 1, 2025, Other recent accounting pronouncements issued by the FASB did not not

Note 2 - Going Concern

Note 2 - Going Concern	12 Months Ended
	Dec. 31, 2023
Notes to Financial Statements
Substantial Doubt about Going Concern [Text Block]	NOTE 2 GOING CONCERN The accompanying consolidated financial statements have been prepared in conformity with generally accepted accounting principles of the United States of America, which contemplate continuation of the Company as a going concern; however, the Company has incurred significant recent losses, which raises substantial doubt about the ability of the Company to continue as a going concern for a period of one no not We continue to analyze various alternatives, including potentially obtaining debt or equity financings or other arrangements. Our future success depends on our ability to raise capital and restore profitability. We cannot be certain that raising additional capital, whether through selling additional debt or equity securities or obtaining a line of credit or other loan, will be available to us or, if available, will be on terms acceptable to us. If we issue additional securities to raise funds, these securities may may may As of December 31, 2023,

Note 3 - Restructuring Costs

Note 3 - Restructuring Costs	12 Months Ended
	Dec. 31, 2023
Notes to Financial Statements
Restructuring and Related Activities Disclosure [Text Block]	NOTE 3 RESTRUCTURING COSTS During the second 2022, CEO separation May 10, 2022, May 12, 2022. March 17, 2022. DKK1,605,000 six Terminated employees second 2022, No China close-down second 2022, Capex commitments second third fourth Write-downs -- The Company’s restructuring costs are as follows for the years ended December 31, 2023 2022: December 31, 2023 December 31, 2022 CEO separation $ - $ 228,975 Terminated employees - 158,199 China close-down - 275,445 Capex commitments - 813,994 Write-downs - 416,553 $ - $ 1,893,166

Note 4 - Inventory

Note 4 - Inventory	12 Months Ended
	Dec. 31, 2023
Notes to Financial Statements
Inventory Disclosure [Text Block]	NOTE 4 Inventory consisted of the following at December 31, 2023 December 31, 2022: 2023 2022 Furnace parts and supplies $ 55,177 $ 66,495 Raw materials 3,301,526 2,474,227 Work in process 1,271,458 982,973 Finished goods and filtration systems 1,507,113 1,201,533 Reserve for excess and obsolescence (867,458 ) (663,227 ) Net Inventory $ 5,267,816 $ 4,062,001 Inventory valuation adjustments for excess and obsolete inventory are calculated based on current inventory levels, movements, expected useful lives, and estimated future demand for the products.

Note 5 - Property and Equipment

Note 5 - Property and Equipment	12 Months Ended
	Dec. 31, 2023
Notes to Financial Statements
Property, Plant and Equipment Disclosure [Text Block]	NOTE 5 - PROPERTY AND EQUIPMENT Property and equipment consisted of the following on December 31, 2023 December 31, 2022: Useful Life 2023 2022 Production equipment 3 - 10 $ 9,433,581 $ 8,027,589 Production equipment - finance lease 3 - 10 5,182,375 3,625,558 Lab equipment 3 - 10 130,909 118,935 Computer equipment 3 - 5 1,141,790 1,070,437 Vehicles 3 - 5 26,897 26,020 Furniture and fixture 5 1,474,032 1,141,424 Furniture and fixture - finance lease 5 260,911 252,397 Leasehold improvements 5 - 10 3,184,871 3,080,946 20,835,366 17,343,306 Less Accumulated Depreciation (10,950,622 ) (8,501,846 ) Less Accumulated Depreciation - finance lease (877,578 ) (544,653 ) Net Property and Equipment $ 9,007,166 $ 8,296,807 Depreciation expense amounted to $2,472,031 and $2,007,112 for the year ended December 31, 2023, 2022, $2,472,031 December 31, 2023,

Note 6 - Leases

Note 6 - Leases	12 Months Ended
	Dec. 31, 2023
Notes to Financial Statements
Lessee, Operating and Finance Leases [Text Block]	NOTE 6 - LEASES The Company leases certain vehicles, real property, production equipment, and office equipment under lease agreements. The Company evaluates each lease to determine its appropriate classification as an operating lease or finance lease for financial reporting purposes. The majority of our operating leases are non-cancelable operating leases for production and office space in Hobro, Aarhus, and Copenhagen, Denmark. The lease agreements expire on November 30, 2034, August 31, 2024, August 31, 2028, During the year ended December 31, 2023, During the year ended December 31, 2023, Supplemental balance sheet information related to leases as of December 31, 2023 2022 December 31, 2023 December 31, 2022 Operating leases Operating lease right-of-use assets $ 4,055,837 $ 3,271,997 Operating lease liabilities – current $ 531,355 $ 561,182 Operating lease liabilities – long-term 3,527,082 2,710,815 Total operating lease liabilities $ 4,058,437 $ 3,271,997 Finance leases Property and equipment, at cost $ 5,443,287 $ 3,877,955 Accumulated depreciation (877,578 ) (544,653 ) Property and equipment, net $ 4,565,709 $ 3,333,302 Finance lease liabilities – current $ 590,550 $ 399,198 Finance lease liabilities – long-term 2,879,932 2,384,011 Total finance lease liabilities $ 3,470,482 $ 2,783,209 Weighted average remaining lease term: Operating leases 8.3 9.6 Finance leases 4.3 5.4 Weighted average discount rate: Operating leases 6.7 % 6.2 % Finance leases 6.0 % 2.8 % Maturities of lease liabilities at December 31, 2023 Operating lease Finance lease 2024 $ 785,707 $ 804,044 2025 702,899 800,510 2026 692,137 764,105 2027 692,137 1,320,097 2028 566,381 356,983 Thereafter 1,810,499 130,196 Total payment under lease agreements 5,249,760 4,175,935 Less imputed interest (1,191,323 ) (705,453 ) Total lease liability $ 4,058,437 $ 3,470,482

Note 7 - Intangible Assets

Note 7 - Intangible Assets	12 Months Ended
	Dec. 31, 2023
Notes to Financial Statements
Intangible Assets Disclosure [Text Block]	NOTE 7 At December 31, 2023 December 31, 2022, Intangible assets consisted of the following at December 31, 2023 December 31, 2022: 2023 2022 Customer relationships $ 489,273 $ 473,308 Patent cost 183,874 177,875 673,148 651,183 Less Accumulated amortization (558,555 ) (438,250 ) Intangible assets, net $ 114,593 $ 212,933 Amortization expense amounted to $105,522 and $81,019 for the years ended December 31, 2023 2022, Expected future amortization expense for the years ended are as follows: Year ending December 31, Amortization Expenses 2024 72,902 2025 7,665 2026 7,665 2027 7,665 2028 7,665 Thereafter 11,031 $ 114,593

Note 8 - Lines of Credit

Note 8 - Lines of Credit	12 Months Ended
	Dec. 31, 2023
Notes to Financial Statements
Debt Disclosure [Text Block]	NOTE 8 In connection with certain orders, the Company provides to customers a working guarantee, prepayment guarantee, or security bond. For that purpose, the Company has a guaranteed credit line of EUR 850,000 (approx. $940,000) secured by a cash deposit. As of December 31, 2023, no

Note 9 - Accounts Payable and A

Note 9 - Accounts Payable and Accrued Liabilities	12 Months Ended
	Dec. 31, 2023
Notes to Financial Statements
Accounts Payable and Accrued Liabilities Disclosure [Text Block]	NOTE 9 ACCOUNTS PAYABLE AND ACCRUED LIABILITIES Accounts payable and accrued liabilities consisted of the following at December 31, 2023 December 31, 2022: December 31, 2023 December 31, 2022 Accounts payable $ 2,444,653 $ 1,389,355 Accrued payroll liabilities 1,223,712 510,727 Product warranty accrual 629,100 898,072 Other accrued expenses 1,697,730 1,678,407 Total $ 5,995,195 $ 4,476,561

Note 10 - Long-term Debt

Note 10 - Long-term Debt	12 Months Ended
	Dec. 31, 2023
Notes to Financial Statements
Long-Term Debt [Text Block]	NOTE 10 LONG-TERM DEBT Convertible Note On March 24, 2021, October 1, 2023 April 8, 2021, The Convertible Note was a senior, unsecured obligation of the Company, payable at 112% of the principal amount at maturity ( October 1, 2023), 805.3992 $1,000 Beginning on March 1, 2022, first 90% three 3 10 no As of June 22, 2022, For the year ended December 31, 2023 2022, Senior Promissory Notes On June 22, 2022, 21 April 21 April five The Notes originally had a term of 24 months and do not not second Additionally, as part of the transaction, the Company issued 28,846 warrants to the placement agent. The warrants issued in this transaction have an exercise price of $5.20 per share, a term of five As a result, the Company recorded an initial debt discount of $695,749, based on the relative fair value of the warrants and Notes issued. The Company determined the fair value of the warrants by using the Black-Scholes Option Pricing Model, with the following assumptions: expected term of 2.5 years, stock price of $3.44, exercise price of $5.20, volatility of 80.8%, risk-free rate of 3.13%, and no On October 13, 2023, No. 1 September 30, 2023, June 20, 2024, January 1, 2026 ( “2023 2023 five September 30, 2023. 2023 June 22, 2022, As a result of the amendment, the Company recorded an initial debt discount of $1,193,206, based on fair value of the warrants issued. The Company determined the fair value of the warrants by using the Black-Scholes Option Pricing Model, with the following assumptions: expected term of 5.0 years, stock price of $3.89, exercise price of $5.20, volatility of 73.66%, risk-free rate of 4.60%, and no The components of notes payable are as follows: December 31, 2023 December 31, 2022 Senior Promissory Notes $ 6,000,000 6,000,000 Less: unamortized debt discount (1,311,989 ) (519,686 ) Senior Promissory Notes payable $ 4,688,011 $ 5,480,314 Current portion of Senior Promissory Notes payable - - Senior Promissory Notes payable, less current portion 4,688,011 5,480,314 Senior Promissory Notes payable $ 4,688,011 $ 5,480,314 For the year ended December 31, 2023, 2022,

Note 11 - Agreements, Commitmen

Note 11 - Agreements, Commitments and Contingencies	12 Months Ended
	Dec. 31, 2023
Notes to Financial Statements
Commitments and Contingencies Disclosure [Text Block]	NOTE 11 AGREEMENTS, COMMITMENTS AND CONTINGENCIES Contingencies -- may In November 2022, 2019 2023. two Product Warranties one three may In addition, the Company sells an extended warranty for certain systems, which generally provides a warranty for up to four The Company periodically assesses the adequacy of its recorded warranty liabilities and adjusts the amounts, as necessary. Factors that affect the warranty liability include the number of units sold, historical and anticipated rates of warranty claims, and the cost per claim. Changes in the Company's current and long-term warranty obligations included in accrued expenses on the balance sheet for the fiscal years ended December 31, 2023 2022 2023 2022 Balance at January 1, $ 898,072 $ 962,313 Warranty costs charged to cost of goods sold 115,401 86,256 Utilization charges against reserve (408,234 ) (93,653 ) Foreign currency effect 23,861 (56,844 ) Balance at December 31, $ 629,100 $ 898,072 The utilization charges against the reserve for the ended December 31, 2023

Note 12 - Income Taxes

Note 12 - Income Taxes	12 Months Ended
	Dec. 31, 2023
Notes to Financial Statements
Income Tax Disclosure [Text Block]	NOTE 12 INCOME TAXES The Company accounts for income taxes in accordance with FASB ASC Topic 740, two first not second 50%. As of December 31, 2023, 2041; not 2027. As of December 31, 2023 December 31, 2022, not not December 31, 2023 December 31, 2022 The temporary differences, tax credits and carry-forwards gave rise to the following deferred tax assets and liabilities at December 31, 2023 December 31, 2022: 2023 2022 Excess of tax over financial accounting $ 1,454,389 $ 973,859 Reserve for excess and obsolete inventory 190,841 145,910 Accrued interest - - Discount amortization 724,353 640,163 Deferred compensation - - Net operating loss carryover 11,580,458 11,057,361 Excess of book over tax depreciation (359,917 ) (272,243 ) Excess of book over tax work in progress 190,196 (253,930 ) Valuation allowance (13,881,379 ) (12,445,765 ) $ (101,059 ) $ (154,645 ) Distributed as: Long-term deferred tax asset - - Long-term deferred tax liability (101,059 ) (154,645 ) $ (101,059 ) $ (154,645 ) A reconciliation of income tax expense at the federal statutory rate to income tax expense at the Company’s effective rate is as follows for the years ended December 31, 2023 2022: 2023 2022 Computed tax at expected statutory rate $ (1,843,244 ) $ (3,025,369 ) State and local income taxes, net of federal benefit (1,177 ) (1,532 ) Non-US income taxed at different rates (44,279 ) (138,596 ) Deferred compensation - 52,500 Non-deductible expenses 5,399 2,749 Non-taxable income - (541 ) Change in valuation allowance 1,755,013 3,035,205 Other (77,919 ) (161,826 ) Income tax expense (benefit) $ (206,207 ) $ (237,410 ) The components of income tax expense (benefit) from continuing operations for the years ended December 31, 2023 2022 2023 2022 Current income taxes: Danish $ (148,668 ) $ (181,417 ) Federal - - State - - Current tax (benefit) $ - $ - Deferred income taxes: Book in excess of tax depreciation $ (386,673 ) $ (346,154 ) Work in progress (442,964 ) (294,233 ) Net operating loss carryover (402,448 ) (2,041,211 ) Valuation allowance 1,128,197 2,319,705 Deferred compensation - (52,500 ) Accrued interest - (13,125 ) Discount amortization 84,190 464,744 Accrued vacation - (4,305 ) Reserve for obsolete inventory (37,841 ) (88,915 Deferred tax expense (benefit) $ (57,539 ) $ (55,994 ) Total tax expense (benefit) $ (206,207 ) $ (237,410 ) Deferred income tax expense / (benefit) results primarily from the reversal of temporary timing differences between tax and financial statement income. The Company files Danish, Chinese, U.S. federal and Minnesota state income tax returns. LiqTech Holding, LiqTech Ceramics, LiqTech Water, LiqTech Plastics, LiqTech Emission Control, and LiqTech Water Projects are generally no 2017 no 2017

Note 13 - Earnings Per Share

Note 13 - Earnings Per Share	12 Months Ended
	Dec. 31, 2023
Notes to Financial Statements
Earnings Per Share [Text Block]	NOTE 13 EARNINGS PER SHARE Basic and diluted net income (loss) per common share is determined by dividing net income (loss) by the weighted average common shares outstanding during the period. For the periods where there is a net loss, stock options, warrants, and Restricted Stock Units have been excluded from the calculation of diluted net loss per common share because their effect would be anti-dilutive. Consequently, the weighted average common shares used to calculate both basic and diluted net loss per common share would be the same. For the year ended December 31, 2023, For the year ended December 31, 2022,

Note 14 - Stockholders' Equity

Note 14 - Stockholders' Equity	12 Months Ended
	Dec. 31, 2023
Notes to Financial Statements
Equity [Text Block]	NOTE 14 Common Stock December 31, 2023 2022, Voting - one not Dividends - may may Liquidation Rights - Other Matters - no no Preferred Stock - one may may The Company has 2,500,000 authorized shares of preferred stock, $0.001 par value. As of December 31, 2023 2022, Reversed Stock Split May 26, 2023, 1 1 1 As a result of the reverse Common Stock split, an amount equal to the decreased value of Common Stock was reclassified from “Common Stock” to “Additional Paid-in Capital.” Stock Issuances Since January 1, 2023, On January 3, 2023, 2022. December 31, 2022. On January 3, 2023, 2022. December 31, 2022. On May, 2023, 1 On June 26, 2023, 2023. June 30, 2023. On August 25, 2023, 2023. September 30, 2023. On September 12, 2023, 12 September 30, 2023. Warrants On May 17, 2022, $23,000,000 On June 22, 2022, 21 April 21 April five On October 13, 2023, September 30, 2023, June 20, 2024, January 1, 2026 ( five September 30, 2023. The following is a summary of the periodic changes in warrants outstanding for the years ended December 31, 2023 2022: 2023 2022 Warrants outstanding at January 1 4,490,104 126,875 Warrants issued in connection with public offering and private placement 531,250 4,363,229 Common stock exchanged to prefunded warrant - - Warrants outstanding at December 31 5,021,354 4,490,104 Stock-based Compensation In 2013, December 31, 2023, one In 2022, “2022 2022 December 31, 2023, 2022 The Company recognizes compensation costs for RSU grants to Directors and management based on the stock price on the date of the grant. The Company recognized stock-based compensation expense related to RSU grants of $627,904 and $934,423 for the years ended December 31, 2023 2022, December 31, 2023, A summary of the status of the RSUs as of December 31, 2023 December 31, 2023 Number of units Weighted Average Fair value Aggregated Intrinsic Outstanding, December 31, 2022 301,111 $ 4.80 $ - Granted 225,604 3.00 - Vested and settled with share issuance (212,254 ) (4.86 ) - Outstanding, December 31, 2023 314,461 $ 3.46 $ -

Note 15 - Segment Reporting

Note 15 - Segment Reporting	12 Months Ended
	Dec. 31, 2023
Notes to Financial Statements
Segment Reporting Disclosure [Text Block]	NOTE 15 SEGMENT REPORTING The Company operates in three January 1, 2020, 2020. Segment information for the business areas is as follows: For the Year Ended December 31, Revenues 2023 2022 Water $ 7,705,080 $ 5,297,286 Ceramics 6,232,628 6,844,861 Plastics 3,736,529 3,528,606 Other 327,415 311,685 Total consolidated revenue $ 18,001,652 $ 15,982,438 For the Year Ended December 31, Loss 2023 2022 Water $ (736,148 ) $ (1,072,530 ) Ceramics (2,640,894 ) (4,648,768 ) Plastics (660,896 ) (794,942 ) Other (4,533,206 ) (7,652,867 ) Total consolidated Loss $ (8,571,145 ) $ (14,169,107 ) For the Year Ended December 31, Total assets 2023 2022 Water $ 9,432,991 $ 7,781,211 Ceramics 14,550,872 13,808,529 Plastics 759,745 1,099,019 Other 11,228,239 17,436,896 Total consolidated assets $ 35,971,847 $ 40,125,655

Note 16 - Significant Customers

Note 16 - Significant Customers / Concentration	12 Months Ended
	Dec. 31, 2023
Notes to Financial Statements
Concentration Risk Disclosure [Text Block]	NOTE 16 SIGNIFICANT CUSTOMERS / CONCENTRATION The following table presents customers accounting for 10% For the Year Ended December 31, 2023 2022 Customer A - % 13 % * Zero or less than 10% The following table presents customers accounting for 10% December 31, 2023 December 31, 2022 Customer B 22 % 17 % Customer C 13 % - % Customer D - % 20 % Customer E - % 10 % As of December 31, 2023, December 31, 2022,

Note 17 - Subsequent Events

Note 17 - Subsequent Events	12 Months Ended
	Dec. 31, 2023
Notes to Financial Statements
Subsequent Events [Text Block]	NOTE 17 SUBSEQUENT EVENTS On January 3, 2024, 2023. On January 3, 2024, 2023. On January 10, 2024, April 10, 2024.

Insider Trading Arrangements

Insider Trading Arrangements	12 Months Ended
	Dec. 31, 2023
Insider Trading Arr Line Items
Material Terms of Trading Arrangement [Text Block]	9B. Other Information Item 5.02. On March 19, 2024, April 1, 2024. 32, January 2022. April 2021, 265 June 2020, one 2013, On January 28, 2022, January 3, 2022 ( 100,000 $14,660 300,000 $43,980 The foregoing descriptions of the Employment Contract and the Addendum are not 10.16, 10.17 10 Mr. Price does not no 404
Rule 10b5-1 Arrangement Adopted [Flag]	false
Rule 10b5-1 Arrangement Terminated [Flag]	false
Non-Rule 10b5-1 Arrangement Adopted [Flag]	false
Non-Rule 10b5-1 Arrangement Terminated [Flag]	false

Schedule II Valuation and Quali

Schedule II Valuation and Qualifying Accounts	12 Months Ended
	Dec. 31, 2023
Notes to Financial Statements
SEC Schedule, 12-09, Schedule of Valuation and Qualifying Accounts Disclosure [Text Block]	15. Exhibits and Financial Statement Schedules (a) Financial Statements and Schedules The financial statements are set forth under Item 8 December 31, 2023 December 31, 2022 10 a. Valuation and Qualifying Accounts for the years ended December 31, 2023 December 31, 2022. 2023 2022 Bad debt expense 82,066 (24,534 ) Reserve for obsolete inventory 177,953 404,160 Balance Beginning of Year Charges to Costs and Expenses Deductions (1) Balance End of Year Year Ended December 31, 2023 Allowance for inventory obsolescence $ 663,227 $ 177,953 $ 26,278 $ 867,458 Allowance for doubtful accounts 59,559 82,066 (6,713 ) 134,912 Totals $ 722,786 $ 260,019 $ 19,565 $ 1,002,370 Year Ended December 31, 2022 Allowance for inventory obsolescence $ 268,470 $ 404,160 $ (9,403 ) $ 663,227 Allowance for doubtful accounts 409,076 (24,534 ) (324,983 ) 59,559 Totals $ 677,546 $ 379,626 $ (334,386 ) $ 722,786 2023 2022 Allowance for doubtful accounts at the beginning of the period $ 59,559 $ 409,076 Bad debt expense 82,066 (24,534 ) Receivables written off during the periods (10,298 ) (295,778 ) Effect of currency translation 3,585 (29,205 ) Allowance for doubtful accounts at the end of the period $ 134,912 $ 59,559 ( 1 Schedules other than that listed above are omitted because the conditions requiring their filing do not not not

Significant Accounting Policies

Significant Accounting Policies (Policies)	12 Months Ended
	Dec. 31, 2023
Accounting Policies [Abstract]
Basis of Accounting, Policy [Policy Text Block]	Business and Basis of Presentation The consolidated financial statements include the accounts of LiqTech International, Inc. and its subsidiaries (the “Company”). The terms "Company", “us", "we" and "our" as used in this report refer to the Company and its subsidiaries, which are set forth below. The Company engages in the development, design, production, marketing, and sale of automated filtering systems, ceramic silicon carbide liquid applications, and diesel particulate air filters in the Americas, Asia-Pacific, Europe, and Middle-East & Africa. Set forth below is a description of the Company and each of its subsidiaries: LiqTech International, Inc., a Nevada corporation organized in July 2004, LiqTech USA Inc., a Delaware corporation and a 100% owned subsidiary of the Company formed in May 2011. LiqTech Holding A/S (formerly known as LiqTech International A/S), a Danish corporation, incorporated on January 15, 2000 ( LiqTech NA, Inc. (“LiqTech NA”), incorporated in Delaware on July 1, 2005, January 2021, LiqTech Water A/S (formerly known as LiqTech Systems A/S), a Danish corporation (“LiqTech Water”), incorporated on September 1, 2009, LiqTech Plastics A/S (formerly known as BS Plastic A/S), a Danish corporation (“LiqTech Plastics”), acquired on September 1, 2019, LiqTech Ceramics A/S, a Danish corporation (“LiqTech Ceramics”), incorporated on December 20, 2019, LiqTech Water Projects A/S, a Danish corporation (“LiqTech Water Projects”), incorporated on July 28, 2020, LiqTech Emission Control A/S, a Danish corporation (“LiqTech Emission Control”), incorporated on March 1, 2021, LiqTech Environment Technologies (China) Co. Ltd. (“LiqTech China”), incorporated on September 23, 2021,
Consolidation, Policy [Policy Text Block]	Consolidation --
Reverse Stock Split [Policy Text Block]	Reverse Stock Split -- May 26, 2023, 1 1 8 1 8 As a result of the reverse Common Stock split, an amount equal to the decreased value of Common Stock was reclassified from “Common Stock” to “Additional Paid-in Capital.”
Foreign Currency Transactions and Translations Policy [Policy Text Block]	Functional Currency / Foreign currency translation -- twelve December 31, 2023 2022.
Cash and Cash Equivalents, Policy [Policy Text Block]	Cash, Cash Equivalents, and Restricted Cash -- three December 31, 2023, 2022, Accounts held in each U.S. institution are insured by the Federal Deposit Insurance Company (“FDIC”) up to $250,000. December 31, 2023 December 31, 2022,
Accounts Receivable [Policy Text Block]	Accounts Receivable -- 326, The roll-forward of the allowance for doubtful accounts as of December 31, 2023 December 31, 2022 2023 2022 Allowance for doubtful accounts at the beginning of the period $ 59,559 $ 409,076 Bad debt expense 82,066 (24,534 ) Receivables written off during the periods (10,298 ) (295,778 ) Effect of currency translation 3,585 (29,205 ) Allowance for doubtful accounts at the end of the period $ 134,912 $ 59,559
Inventory, Policy [Policy Text Block]	Inventory first first For inventory produced, standard costs that approximate actual cost on the FIFO method are used to value inventory. Standard costs are reviewed at least annually by management or more often in the event that circumstances indicate a change in cost has occurred. Work in process and finished goods include material, labor, and production overhead costs. The Company adjusts the value of its inventory to the extent management determines that the cost cannot be recovered due to obsolescence or other factors. Inventory valuation adjustments for excess and obsolete inventory are calculated based on current inventory levels, movement, expected useful lives, and estimated future demand for our products.
Receivable [Policy Text Block]	Contracts Assets / Liabilities not Contract assets also include unbilled receivables, which usually comprise the last invoice remaining after the delivery of the water treatment unit, where revenue is recognized at the transfer of control based upon signed acceptance of the unit by the customer. Most commonly, this invoice is sent to the customer at commissioning of the product or no 12
Assets Held for Sale [Policy Text Block]	Assets Held for Sale 1 2 3 4 one 5 6
Lessee, Leases [Policy Text Block]	Leases -- not 12 not not may
Property, Plant and Equipment, Policy [Policy Text Block]	Property and Equipment -- three ten
Impairment or Disposal of Long-Lived Assets, Policy [Policy Text Block]	Long-lived Assets may not not Impairments of long-lived assets are determined for groups of assets related to the lowest level of identifiable independent cash flows. Due to the Company’s asset usage model and the interchangeable nature of its ceramic filter manufacturing capacity, the Company must make subjective judgments in determining the independent cash flows that can be related to specific asset groupings. In addition, as the Company makes manufacturing process changes and other factory planning decisions, it must make subjective judgments regarding the remaining useful lives of assets, primarily process-specific filter manufacturing tools and building improvements. If the Company determines that the useful lives of assets are shorter than it had originally estimated, the Company accelerates the rate of depreciation over the assets’ new, shorter useful lives. Management has analyzed the impact of the current economic climate on its financial statements as of December 31, 2023, not December 31, 2023 2022,
Goodwill and Intangible Assets, Policy [Policy Text Block]	Goodwill and Intangible Assets -- not Acquired intangible assets with determinable useful lives are amortized on a straight-line or accelerated basis over the estimated periods benefited, ranging from one ten five The Company evaluates the recoverability of long-lived assets by comparing the carrying amount of an asset to estimated future net undiscounted cash flows generated by the asset. If such assets are considered to be impaired, the impairment recognized is measured as the amount by which the carrying value of the assets exceeds the fair value of the assets. The evaluation of recoverability involves estimates of future operating cash flows based upon certain forecasted assumptions, including, but not Goodwill is not
Revenue [Policy Text Block]	Revenue Recognition 606, five 1 2 3 4 5 The Company sells products throughout the world; sales by geographical region are as follows for the year ended December 31, 2023 2022: % Distribution For the Year Ended December 31 2023 2022 2023 2022 Americas 12 % 7 % $ 2,125,460 $ 1,073,433 Asia-Pacific 14 % 21 % 2,506,215 3,406,420 Europe 65 % 59 % 11,820,674 9,379,337 Middle East & Africa 9 % 13 % 1,549,303 2,123,248 100 % 100 % $ 18,001,652 $ 15,982,438 The Company’s sales by product line are as follows for the years ended December 31, 2023 2022: % Distribution For the Year Ended December 31 2023 2022 2023 2022 Water 42 % 33 % $ 7,705,080 $ 5,297,286 Ceramics 35 % 43 % 6,232,628 6,844,861 Plastics 21 % 22 % 3,736,529 3,528,606 Corporate 2 % 2 % 327,415 311,685 100 % 100 % $ 18,001,652 $ 15,982,438 For Water (systems and aftermarket), Ceramics (diesel particulate filters and membranes), and Plastics (components), revenue is recognized when performance obligations specified within the terms of a contract with the customer are satisfied, which occurs when control of the product transfers to the customer or when services are rendered by the Company. The majority of the Company's sales contracts contain performance obligations satisfied at a point in time when title along with risks and rewards of ownership have transferred to the customer. This generally occurs when the product is shipped or accepted by the customer. Revenue for service contracts is recognized as the services are provided. Revenue is measured as the amount of consideration expected to be received in exchange for transferring the goods or providing services. The satisfaction of performance obligations under the terms of a revenue contract generally gives rise to the right to receive payment from the customer. The Company's standard payment terms vary by the type and location of the customer and the products or services offered. Generally, the time between when revenue is recognized and when payment is due is not not For contracts with customers that include multiple performance obligations, judgment is required to determine whether performance obligations specified in these contracts are distinct and should be accounted for as separate revenue transactions for recognition purposes. For such arrangements, revenue is allocated to each performance obligation based on its relative standalone selling price. Standalone selling prices are generally determined based on the prices charged to customers or using an expected cost-plus margin. System sales are recognized when the Company transfers control to the customer based upon sales and delivery conditions specified in the sales contract. This typically occurs upon shipment of the system from the production facility but can also occur upon other agreed delivery terms. In connection with the completion of the system, it is normal procedure to issue a Factory Acceptance Test (“FAT”) asserting that the customer has accepted the performance of the system as it is being shipped from our production facility in Hobro. As part of the performance obligation, the customer is normally offered commissioning services (final assembly and configuration at a place designated by the customer), and this commissioning is therefore considered a second second first Aftermarket sales represent parts, extended warranties, and maintenance services. For the sale of aftermarket parts, the Company transfers control and recognizes revenue when parts are shipped to the customer. When customers are given the right to return eligible parts and accessories, the Company estimates the expected returns based on an analysis of historical experience. The Company adjusts estimated revenues at the earlier of when the most likely amount of consideration expected to be received changes or when the consideration becomes fixed. The Company recognizes revenue for extended warranty and maintenance agreements based on the standalone selling price over the life of the contract. The Company has received long-term contracts for grants from government entities for the development and use of silicon carbide membranes in various water filtration and treatment applications and historically in the installation of various water filtration systems. We measure the transfer of control of the performance obligation on long-term contracts utilizing the cost-to-cost measure of progress, with cost of revenue including direct costs such as labor and materials. Under the cost-to-cost approach, the use of estimated costs to complete each performance obligation is a significant variable in the process of determining recognized revenue and a significant factor in the accounting for such performance obligations. The timing of when we bill our customers is generally dependent upon advance billings terms, milestone billings based on completion of certain phases of the work, or when services are provided or products are shipped. Projects with performance obligations recognized over time that have costs and estimated earnings recognized to date in excess of cumulative billings are reported on our balance sheet as Contract assets. Projects with performance obligations recognized over time that have cumulative billings in excess of costs and estimated earnings recognized to date are reported on our balance sheet as Contract liabilities. The roll-forward of Contract Assets/Liabilities for the year ended December 31, 2023 December 31, 2022 2023 2022 Cost incurred $ 3,225,728 $ 3,860,179 Unbilled project deliveries 582,557 950,105 VAT 329,980 229,006 Other receivables 92,619 45,814 Prepayments (1,688,427 ) (3,363,039 ) Deferred Revenue (33,360 ) (118,327 ) $ 2,509,097 $ 1,603,738 Distributed as follows: Contract assets $ 2,891,744 $ 2,253,295 Contract liabilities (382,647 ) (649,557 ) $ 2,509,097 $ 1,603,738
Cost of Goods and Service [Policy Text Block]	Cost of Sales --
Advertising Cost [Policy Text Block]	Advertising Cost -- December 31, 2023 2022,
Research and Development Expense, Policy [Policy Text Block]	Research and Development Cost -- December 31, 2023 2022
Income Tax, Policy [Policy Text Block]	Income Taxes -- 740:
Commitments and Contingencies, Policy [Policy Text Block]	Loss Contingencies may
Earnings Per Share, Policy [Policy Text Block]	Income/(Loss) Per Share -- 260, not
Share-Based Payment Arrangement [Policy Text Block]	Stock Awards -- 718, December 31, 2023 2022,
Fair Value Measurement, Policy [Policy Text Block]	Fair Value of Financial Instruments -- 820. three ● Level 1. ● Level 2. ● Level 3. no Unless otherwise disclosed, the fair value of the Company’s financial instruments including cash, accounts receivable, other receivables, prepaid expenses, accounts payable, and accrued expenses approximate their recorded values due to their short-term maturities.
Use of Estimates, Policy [Policy Text Block]	Accounting Estimates --
New Accounting Pronouncements, Policy [Policy Text Block]	Recent Accounting Pronouncements -- December 2023, 2023 09, 740 1 2 2023 09 December 15, 2025, In November 2023, 2023 07, 280 2023 07 December 15, 2023, December 15, 2024, In August 2023, 2023 05, 805 60 2023 05 January 1, 2025, Other recent accounting pronouncements issued by the FASB did not not

Note 1 - Summary of Significa_2

Note 1 - Summary of Significant Accounting Policies (Tables)	12 Months Ended
	Dec. 31, 2023
Notes Tables
Financing Receivable, Allowance for Credit Loss [Table Text Block]	2023 2022 Allowance for doubtful accounts at the beginning of the period $ 59,559 $ 409,076 Bad debt expense 82,066 (24,534 ) Receivables written off during the periods (10,298 ) (295,778 ) Effect of currency translation 3,585 (29,205 ) Allowance for doubtful accounts at the end of the period $ 134,912 $ 59,559
Schedule of Revenue from External Customers Attributed to Foreign Countries by Geographic Area [Table Text Block]	% Distribution For the Year Ended December 31 2023 2022 2023 2022 Americas 12 % 7 % $ 2,125,460 $ 1,073,433 Asia-Pacific 14 % 21 % 2,506,215 3,406,420 Europe 65 % 59 % 11,820,674 9,379,337 Middle East & Africa 9 % 13 % 1,549,303 2,123,248 100 % 100 % $ 18,001,652 $ 15,982,438
Reconciliation of Revenue from Segments to Consolidated [Table Text Block]	% Distribution For the Year Ended December 31 2023 2022 2023 2022 Water 42 % 33 % $ 7,705,080 $ 5,297,286 Ceramics 35 % 43 % 6,232,628 6,844,861 Plastics 21 % 22 % 3,736,529 3,528,606 Corporate 2 % 2 % 327,415 311,685 100 % 100 % $ 18,001,652 $ 15,982,438
Contract with Customer, Contract Asset, Contract Liability, and Receivable [Table Text Block]	2023 2022 Cost incurred $ 3,225,728 $ 3,860,179 Unbilled project deliveries 582,557 950,105 VAT 329,980 229,006 Other receivables 92,619 45,814 Prepayments (1,688,427 ) (3,363,039 ) Deferred Revenue (33,360 ) (118,327 ) $ 2,509,097 $ 1,603,738 Distributed as follows: Contract assets $ 2,891,744 $ 2,253,295 Contract liabilities (382,647 ) (649,557 ) $ 2,509,097 $ 1,603,738

Note 3 - Restructuring Costs (T

Note 3 - Restructuring Costs (Tables)	12 Months Ended
	Dec. 31, 2023
Notes Tables
Restructuring and Related Costs [Table Text Block]	December 31, 2023 December 31, 2022 CEO separation $ - $ 228,975 Terminated employees - 158,199 China close-down - 275,445 Capex commitments - 813,994 Write-downs - 416,553 $ - $ 1,893,166

Note 4 - Inventory (Tables)

Note 4 - Inventory (Tables)	12 Months Ended
	Dec. 31, 2023
Notes Tables
Schedule of Inventory, Current [Table Text Block]	2023 2022 Furnace parts and supplies $ 55,177 $ 66,495 Raw materials 3,301,526 2,474,227 Work in process 1,271,458 982,973 Finished goods and filtration systems 1,507,113 1,201,533 Reserve for excess and obsolescence (867,458 ) (663,227 ) Net Inventory $ 5,267,816 $ 4,062,001

Note 5 - Property and Equipme_2

Note 5 - Property and Equipment (Tables)	12 Months Ended
	Dec. 31, 2023
Notes Tables
Property, Plant and Equipment [Table Text Block]	Useful Life 2023 2022 Production equipment 3 - 10 $ 9,433,581 $ 8,027,589 Production equipment - finance lease 3 - 10 5,182,375 3,625,558 Lab equipment 3 - 10 130,909 118,935 Computer equipment 3 - 5 1,141,790 1,070,437 Vehicles 3 - 5 26,897 26,020 Furniture and fixture 5 1,474,032 1,141,424 Furniture and fixture - finance lease 5 260,911 252,397 Leasehold improvements 5 - 10 3,184,871 3,080,946 20,835,366 17,343,306 Less Accumulated Depreciation (10,950,622 ) (8,501,846 ) Less Accumulated Depreciation - finance lease (877,578 ) (544,653 ) Net Property and Equipment $ 9,007,166 $ 8,296,807

Note 6 - Leases (Tables)

Note 6 - Leases (Tables)	12 Months Ended
	Dec. 31, 2023
Notes Tables
Lessee, Operating and Finance Lease, Assets and Liabilities [Table Text Block]	December 31, 2023 December 31, 2022 Operating leases Operating lease right-of-use assets $ 4,055,837 $ 3,271,997 Operating lease liabilities – current $ 531,355 $ 561,182 Operating lease liabilities – long-term 3,527,082 2,710,815 Total operating lease liabilities $ 4,058,437 $ 3,271,997 Finance leases Property and equipment, at cost $ 5,443,287 $ 3,877,955 Accumulated depreciation (877,578 ) (544,653 ) Property and equipment, net $ 4,565,709 $ 3,333,302 Finance lease liabilities – current $ 590,550 $ 399,198 Finance lease liabilities – long-term 2,879,932 2,384,011 Total finance lease liabilities $ 3,470,482 $ 2,783,209 Weighted average remaining lease term: Operating leases 8.3 9.6 Finance leases 4.3 5.4 Weighted average discount rate: Operating leases 6.7 % 6.2 % Finance leases 6.0 % 2.8 %
Maturity of Operating and Finance Lease Liabilities [Table Text Block]	Operating lease Finance lease 2024 $ 785,707 $ 804,044 2025 702,899 800,510 2026 692,137 764,105 2027 692,137 1,320,097 2028 566,381 356,983 Thereafter 1,810,499 130,196 Total payment under lease agreements 5,249,760 4,175,935 Less imputed interest (1,191,323 ) (705,453 ) Total lease liability $ 4,058,437 $ 3,470,482

Note 7 - Intangible Assets (Tab

Note 7 - Intangible Assets (Tables)	12 Months Ended
	Dec. 31, 2023
Notes Tables
Schedule of Finite-Lived Intangible Assets [Table Text Block]	2023 2022 Customer relationships $ 489,273 $ 473,308 Patent cost 183,874 177,875 673,148 651,183 Less Accumulated amortization (558,555 ) (438,250 ) Intangible assets, net $ 114,593 $ 212,933
Schedule of Finite-Lived Intangible Assets, Future Amortization Expense [Table Text Block]	Year ending December 31, Amortization Expenses 2024 72,902 2025 7,665 2026 7,665 2027 7,665 2028 7,665 Thereafter 11,031 $ 114,593

Note 9 - Accounts Payable and_2

Note 9 - Accounts Payable and Accrued Liabilities (Tables)	12 Months Ended
	Dec. 31, 2023
Notes Tables
Schedule of Accounts Payable and Accrued Liabilities [Table Text Block]	December 31, 2023 December 31, 2022 Accounts payable $ 2,444,653 $ 1,389,355 Accrued payroll liabilities 1,223,712 510,727 Product warranty accrual 629,100 898,072 Other accrued expenses 1,697,730 1,678,407 Total $ 5,995,195 $ 4,476,561

Note 10 - Long-term Debt (Table

Note 10 - Long-term Debt (Tables)	12 Months Ended
	Dec. 31, 2023
Notes Tables
Schedule of Debt [Table Text Block]	December 31, 2023 December 31, 2022 Senior Promissory Notes $ 6,000,000 6,000,000 Less: unamortized debt discount (1,311,989 ) (519,686 ) Senior Promissory Notes payable $ 4,688,011 $ 5,480,314 Current portion of Senior Promissory Notes payable - - Senior Promissory Notes payable, less current portion 4,688,011 5,480,314 Senior Promissory Notes payable $ 4,688,011 $ 5,480,314

Note 11 - Agreements, Commitm_2

Note 11 - Agreements, Commitments and Contingencies (Tables)	12 Months Ended
	Dec. 31, 2023
Notes Tables
Schedule of Product Warranty Liability [Table Text Block]	2023 2022 Balance at January 1, $ 898,072 $ 962,313 Warranty costs charged to cost of goods sold 115,401 86,256 Utilization charges against reserve (408,234 ) (93,653 ) Foreign currency effect 23,861 (56,844 ) Balance at December 31, $ 629,100 $ 898,072

Note 12 - Income Taxes (Tables)

Note 12 - Income Taxes (Tables)	12 Months Ended
	Dec. 31, 2023
Notes Tables
Schedule of Deferred Tax Assets and Liabilities [Table Text Block]	2023 2022 Excess of tax over financial accounting $ 1,454,389 $ 973,859 Reserve for excess and obsolete inventory 190,841 145,910 Accrued interest - - Discount amortization 724,353 640,163 Deferred compensation - - Net operating loss carryover 11,580,458 11,057,361 Excess of book over tax depreciation (359,917 ) (272,243 ) Excess of book over tax work in progress 190,196 (253,930 ) Valuation allowance (13,881,379 ) (12,445,765 ) $ (101,059 ) $ (154,645 ) Distributed as: Long-term deferred tax asset - - Long-term deferred tax liability (101,059 ) (154,645 ) $ (101,059 ) $ (154,645 )
Schedule of Effective Income Tax Rate Reconciliation [Table Text Block]	2023 2022 Computed tax at expected statutory rate $ (1,843,244 ) $ (3,025,369 ) State and local income taxes, net of federal benefit (1,177 ) (1,532 ) Non-US income taxed at different rates (44,279 ) (138,596 ) Deferred compensation - 52,500 Non-deductible expenses 5,399 2,749 Non-taxable income - (541 ) Change in valuation allowance 1,755,013 3,035,205 Other (77,919 ) (161,826 ) Income tax expense (benefit) $ (206,207 ) $ (237,410 )
Schedule of Components of Income Tax Expense (Benefit) [Table Text Block]	2023 2022 Current income taxes: Danish $ (148,668 ) $ (181,417 ) Federal - - State - - Current tax (benefit) $ - $ - Deferred income taxes: Book in excess of tax depreciation $ (386,673 ) $ (346,154 ) Work in progress (442,964 ) (294,233 ) Net operating loss carryover (402,448 ) (2,041,211 ) Valuation allowance 1,128,197 2,319,705 Deferred compensation - (52,500 ) Accrued interest - (13,125 ) Discount amortization 84,190 464,744 Accrued vacation - (4,305 ) Reserve for obsolete inventory (37,841 ) (88,915 Deferred tax expense (benefit) $ (57,539 ) $ (55,994 ) Total tax expense (benefit) $ (206,207 ) $ (237,410 )

Note 14 - Stockholders' Equity

Note 14 - Stockholders' Equity (Tables)	12 Months Ended
	Dec. 31, 2023
Notes Tables
Schedule of Stockholders' Equity Note, Warrants or Rights [Table Text Block]	2023 2022 Warrants outstanding at January 1 4,490,104 126,875 Warrants issued in connection with public offering and private placement 531,250 4,363,229 Common stock exchanged to prefunded warrant - - Warrants outstanding at December 31 5,021,354 4,490,104
Schedule of Nonvested Restricted Stock Units Activity [Table Text Block]	December 31, 2023 Number of units Weighted Average Fair value Aggregated Intrinsic Outstanding, December 31, 2022 301,111 $ 4.80 $ - Granted 225,604 3.00 - Vested and settled with share issuance (212,254 ) (4.86 ) - Outstanding, December 31, 2023 314,461 $ 3.46 $ -

Note 15 - Segment Reporting (Ta

Note 15 - Segment Reporting (Tables)	12 Months Ended
	Dec. 31, 2023
Notes Tables
Schedule of Segment Reporting Information, by Segment [Table Text Block]	For the Year Ended December 31, Revenues 2023 2022 Water $ 7,705,080 $ 5,297,286 Ceramics 6,232,628 6,844,861 Plastics 3,736,529 3,528,606 Other 327,415 311,685 Total consolidated revenue $ 18,001,652 $ 15,982,438 For the Year Ended December 31, Loss 2023 2022 Water $ (736,148 ) $ (1,072,530 ) Ceramics (2,640,894 ) (4,648,768 ) Plastics (660,896 ) (794,942 ) Other (4,533,206 ) (7,652,867 ) Total consolidated Loss $ (8,571,145 ) $ (14,169,107 ) For the Year Ended December 31, Total assets 2023 2022 Water $ 9,432,991 $ 7,781,211 Ceramics 14,550,872 13,808,529 Plastics 759,745 1,099,019 Other 11,228,239 17,436,896 Total consolidated assets $ 35,971,847 $ 40,125,655

Note 16 - Significant Custome_2

Note 16 - Significant Customers / Concentration (Tables)	12 Months Ended
	Dec. 31, 2023
Notes Tables
Schedules of Concentration of Risk, by Risk Factor [Table Text Block]	For the Year Ended December 31, 2023 2022 Customer A - % 13 % December 31, 2023 December 31, 2022 Customer B 22 % 17 % Customer C 13 % - % Customer D - % 20 % Customer E - % 10 %

Schedule II Valuation and Qua_2

Schedule II Valuation and Qualifying Accounts (Tables)	12 Months Ended
	Dec. 31, 2023
Notes Tables
Valuation Allowances and Reserves, Bad Debt Expense and Reserve for Obsolete Inventory [Table Text Block]	2023 2022 Bad debt expense 82,066 (24,534 ) Reserve for obsolete inventory 177,953 404,160
Valuation Allowances and Reserves [Table Text Block]	Balance Beginning of Year Charges to Costs and Expenses Deductions (1) Balance End of Year Year Ended December 31, 2023 Allowance for inventory obsolescence $ 663,227 $ 177,953 $ 26,278 $ 867,458 Allowance for doubtful accounts 59,559 82,066 (6,713 ) 134,912 Totals $ 722,786 $ 260,019 $ 19,565 $ 1,002,370 Year Ended December 31, 2022 Allowance for inventory obsolescence $ 268,470 $ 404,160 $ (9,403 ) $ 663,227 Allowance for doubtful accounts 409,076 (24,534 ) (324,983 ) 59,559 Totals $ 677,546 $ 379,626 $ (334,386 ) $ 722,786
Valuation and Qualifying Accounts, Allowance for Credit Loss [Table Text Block]	2023 2022 Allowance for doubtful accounts at the beginning of the period $ 59,559 $ 409,076 Bad debt expense 82,066 (24,534 ) Receivables written off during the periods (10,298 ) (295,778 ) Effect of currency translation 3,585 (29,205 ) Allowance for doubtful accounts at the end of the period $ 134,912 $ 59,559

Note 1 - Summary of Significa_3

Note 1 - Summary of Significant Accounting Policies (Details Textual)		12 Months Ended
	May 26, 2023 $ / shares	Dec. 31, 2023 USD ($) $ / shares	Dec. 31, 2022 USD ($) $ / shares	Apr. 08, 2021 $ / shares
Common Stock, Par or Stated Value Per Share (in dollars per share) | $ / shares	$ 0.001	$ 0.001	$ 0.001	$ 0.001
Restricted Cash and Cash Equivalents, Current		$ 941,361	$ 1,440,394
Cash, Uninsured Amount		0	12,999,271
Tangible Asset Impairment Charges		0	0
Advertising Expense		70,580	144,043
Research and Development Expense, Total		1,418,842	1,835,890
Employees [Member]
Share-Based Payment Arrangement, Expense		$ 627,904	$ 934,423
Customer Relationships [Member]
Finite-Lived Intangible Asset, Useful Life (Year)		5 years
Minimum [Member]
Property, Plant and Equipment, Useful Life (Year)		3 years
Finite-Lived Intangible Asset, Useful Life (Year)		1 year
Maximum [Member]
Property, Plant and Equipment, Useful Life (Year)		10 years
Finite-Lived Intangible Asset, Useful Life (Year)		10 years
Reverse Stock Split [Member]
Stockholders' Equity Note, Stock Split, Conversion Ratio	8
LiqTech USA [Member] | LiqTech International DK [Member]
Percentage of Subsidiary Owned		100%
LiqTech USA [Member] | LiqTech NA [Member]
Percentage of Subsidiary Owned		100%
LiqTech USA [Member]
Noncontrolling Interest, Ownership Percentage by Parent		100%

Note 1 - Summary of Significa_4

Note 1 - Summary of Significant Accounting Policies - Allowance for Doubtful Accounts (Details) - USD ($)	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Allowance for doubtful accounts	$ 59,559	$ 409,076
Bad debt expense	82,066	(24,534)
Receivables written off during the periods	(10,298)	(295,778)
Effect of currency translation	3,585	(29,205)
Allowance for doubtful accounts	$ 134,912	$ 59,559

Note 1 - Summary of Significa_5

Note 1 - Summary of Significant Accounting Policies - Net Sales by Geographical Region (Details) - USD ($)	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Revenue, Percentage	100%	100%
Revenue	$ 18,001,652	$ 15,982,438
Reportable Geographical Components [Member] | Americas [Member]
Revenue, Percentage	12%	7%
Revenue	$ 2,125,460	$ 1,073,433
Reportable Geographical Components [Member] | Asia Pacific [Member]
Revenue, Percentage	14%	21%
Revenue	$ 2,506,215	$ 3,406,420
Reportable Geographical Components [Member] | Europe [Member]
Revenue, Percentage	65%	59%
Revenue	$ 11,820,674	$ 9,379,337
Reportable Geographical Components [Member] | Middle East and Africa [Member]
Revenue, Percentage	9%	13%
Revenue	$ 1,549,303	$ 2,123,248

Note 1 - Summary of Significa_6

Note 1 - Summary of Significant Accounting Policies - Sales by Product Line (Details) - USD ($)	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Revenue, Percentage	100%	100%
Revenue	$ 18,001,652	$ 15,982,438
Water Segment [Member]
Revenue, Percentage	42%	33%
Revenue	$ 7,705,080	$ 5,297,286
Ceramics Segment [Member]
Revenue, Percentage	35%	43%
Revenue	$ 6,232,628	$ 6,844,861
Plastics Segment [Member]
Revenue, Percentage	21%	22%
Revenue	$ 3,736,529	$ 3,528,606
Corporate Segment [Member]
Revenue, Percentage	2%	2%
Revenue	$ 327,415	$ 311,685

Note 1 - Summary of Significa_7

Note 1 - Summary of Significant Accounting Policies - Contract Assets and Liabilities (Details) - USD ($)	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Cost incurred	$ 3,225,728	$ 3,860,179
Unbilled project deliveries	582,557	950,105
VAT	329,980	229,006
Other receivables	92,619	45,814
Prepayments	(1,688,427)	(3,363,039)
Deferred Revenue	(33,360)	(118,327)
Contract with Customer, Asset (Liability), Net	2,509,097	1,603,738
Contract assets	2,891,744	2,253,295
Contract liabilities	(382,647)	(649,557)
Contract with Customer, Asset (Liability), Net	$ 2,509,097	$ 1,603,738

Note 2 - Going Concern (Details

Note 2 - Going Concern (Details Textual) - USD ($)	Dec. 31, 2023	Dec. 31, 2022
Cash and Cash Equivalents, at Carrying Value	$ 10,422,181
Working Capital Deficit	14,590,430
Retained Earnings (Accumulated Deficit)	(75,922,180)	$ (67,351,035)
Assets	35,971,847	40,125,655
Liabilities	$ 18,695,831	$ 16,816,283

Note 3 - Restructuring Costs (D

Note 3 - Restructuring Costs (Details Textual)			3 Months Ended	6 Months Ended	12 Months Ended
	May 10, 2022 USD ($)	May 10, 2022 DKK (kr)	Jun. 30, 2022 USD ($)	Dec. 31, 2022 USD ($)	Dec. 31, 2023 USD ($)	Dec. 31, 2022 USD ($)	Mar. 31, 2022 USD ($)
Restructuring Charges, Total					$ 0	$ 1,893,166
Capex Commitments [Member]
Other Commitment, Total							$ 10,300,000
CEO Separation [Member]
Restructuring Charges, Total					0	228,975
Employee Severance [Member]
Restructuring Charges, Total					0	158,199
Facility Closing [Member]
Restructuring Charges, Total					0	275,445
Capex Commitments [Member]
Restructuring Charges, Total					$ 0	813,994
Restructuring Program [Member]
Restructuring Charges, Total			$ 1,893,166
Impairment, Long-Lived Asset, Held-for-Use, Total			240,576
Inventory Write-down			175,977
Restructuring Program [Member] | CEO Separation [Member]
Restructuring Charges, Total	$ 228,975	kr 1,605,000
Restructuring Program [Member] | Employee Severance [Member]
Restructuring Charges, Total			$ 158,199
Restructuring and Related Cost, Percentage Reduction			25%
Restructuring Program [Member] | Facility Closing [Member]
Restructuring Charges, Total			$ 275,445
Restructuring Program [Member] | Capex Commitments [Member]
Restructuring Reserve, Ending Balance			$ 668,606	$ 813,994		$ 813,994
Restructuring Reserve, Accrual Adjustment				$ 145,388

Note 3 - Restructuring Costs -

Note 3 - Restructuring Costs - Restructuring Costs (Details) - USD ($)	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Restructuring costs	$ 0	$ 1,893,166
CEO Separation [Member]
Restructuring costs	0	228,975
Employee Severance [Member]
Restructuring costs	0	158,199
Facility Closing [Member]
Restructuring costs	0	275,445
Capex Commitments [Member]
Restructuring costs	0	813,994
Write-down [Member]
Restructuring costs	$ 0	$ 416,553

Note 4 - Inventory - Summary of

Note 4 - Inventory - Summary of Inventory (Details) - USD ($)	Dec. 31, 2023	Dec. 31, 2022
Furnace parts and supplies	$ 55,177	$ 66,495
Raw materials	3,301,526	2,474,227
Work in process	1,271,458	982,973
Finished goods and filtration systems	1,507,113	1,201,533
Reserve for excess and obsolescence	(867,458)	(663,227)
Net Inventory	$ 5,267,816	$ 4,062,001

Note 5 - Property and Equipme_3

Note 5 - Property and Equipment (Details Textual) - USD ($)	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Depreciation, Total	$ 2,472,031	$ 2,007,112
Cost of Sales [Member]
Depreciation, Total	2,178,993
Operating Expense [Member]
Depreciation, Total	$ 293,038

Note 5 - Property and Equipme_4

Note 5 - Property and Equipment - Summary of Property and Equipment (Details) - USD ($)	Dec. 31, 2023	Dec. 31, 2022
Property and equipment, gross	$ 20,835,366	$ 17,343,306
Less Accumulated Depreciation	(11,828,200)	(9,046,499)
Net Property and Equipment	9,007,166	8,296,807
Production Equipment [Member]
Property and equipment, gross	9,433,581	8,027,589
Production Equipment Under Finance Lease [Member]
Property and equipment, gross	5,182,375	3,625,558
Lab Equipment [Member]
Property and equipment, gross	130,909	118,935
Computer Equipment [Member]
Property and equipment, gross	1,141,790	1,070,437
Vehicles [Member]
Property and equipment, gross	$ 26,897	26,020
Furniture and Fixtures [Member]
Useful Life (Year)	5 years
Property and equipment, gross	$ 1,474,032	1,141,424
Furniture and Fixtures Under Finance Lease [Member]
Useful Life (Year)	5 years
Property and equipment, gross	$ 260,911	252,397
Leasehold Improvements [Member]
Property and equipment, gross	3,184,871	3,080,946
Property, Plant and Equipment Not Under Finance Lease [Member]
Less Accumulated Depreciation	(10,950,622)	(8,501,846)
Property, Plant and Equipment Under Finance Lease [Member]
Less Accumulated Depreciation	$ (877,578)	$ (544,653)
Minimum [Member]
Useful Life (Year)	3 years
Minimum [Member] | Production Equipment [Member]
Useful Life (Year)	3 years
Minimum [Member] | Production Equipment Under Finance Lease [Member]
Useful Life (Year)	3 years
Minimum [Member] | Lab Equipment [Member]
Useful Life (Year)	3 years
Minimum [Member] | Computer Equipment [Member]
Useful Life (Year)	3 years
Minimum [Member] | Vehicles [Member]
Useful Life (Year)	3 years
Minimum [Member] | Leasehold Improvements [Member]
Useful Life (Year)	5 years
Maximum [Member]
Useful Life (Year)	10 years
Maximum [Member] | Production Equipment [Member]
Useful Life (Year)	10 years
Maximum [Member] | Production Equipment Under Finance Lease [Member]
Useful Life (Year)	10 years
Maximum [Member] | Lab Equipment [Member]
Useful Life (Year)	10 years
Maximum [Member] | Computer Equipment [Member]
Useful Life (Year)	5 years
Maximum [Member] | Vehicles [Member]
Useful Life (Year)	5 years
Maximum [Member] | Leasehold Improvements [Member]
Useful Life (Year)	10 years

Note 6 - Leases (Details Textua

Note 6 - Leases (Details Textual)	12 Months Ended
	Dec. 31, 2023 USD ($)
Operating Lease, Payments	$ 754,490
Finance Lease, Principal Payments	441,696
Finance Lease Expense	159,766
Other Expense [Member]
Operating Lease, Payments	$ 725,337

Note 6 - Leases - Balance Sheet

Note 6 - Leases - Balance Sheet Information (Details) - USD ($)	Dec. 31, 2023	Dec. 31, 2022
Operating lease right-of-use assets	$ 4,055,837	$ 3,271,997
Operating lease liabilities – current	531,355	561,182
Operating lease liabilities – long-term	3,527,082	2,710,815
Total operating lease liability	4,058,437	3,271,997
Property and equipment, at cost	5,443,287	3,877,955
Accumulated depreciation	(877,578)	(544,653)
Finance lease liabilities – current	590,550	399,198
Finance lease liabilities – long-term	2,879,932	2,384,011
Total finance lease liabilities	$ 3,470,482	$ 2,783,209
Operating leases (Year)	8 years 3 months 18 days	9 years 7 months 6 days
Finance leases (Year)	4 years 3 months 18 days	5 years 4 months 24 days
Operating leases	6.70%	6.20%
Finance leases	6%	2.80%
Property and equipment, Net [Member]
Property and equipment, net	$ 4,565,709	$ 3,333,302

Note 6 - Leases - Maturities of

Note 6 - Leases - Maturities of Lease Liabilities (Details) - USD ($)	Dec. 31, 2023	Dec. 31, 2022
2024, operating lease	$ 785,707
2024, financing lease	804,044
2025, operating lease	702,899
2025, financing lease	800,510
2026, operating lease	692,137
2026, financing lease	764,105
2027, operating lease	692,137
2027, financing lease	1,320,097
2028, operating lease	566,381
2028, financing lease	356,983
Thereafter, operating lease	1,810,499
Thereafter, finance lease	130,196
Total payment under operating lease agreements	5,249,760
Total payment under lease agreements	4,175,935
Less imputed interest on operating lease	(1,191,323)
Less imputed interest on finance lease	(705,453)
Total operating lease liability	4,058,437	$ 3,271,997
Total finance lease liability	$ 3,470,482	$ 2,783,209

Note 7 - Intangible Assets (Det

Note 7 - Intangible Assets (Details Textual) - USD ($)	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Amortization of Intangible Assets	$ 105,522	$ 81,019

Note 7 - Intangible Assets - Sc

Note 7 - Intangible Assets - Schedule of Intangible Assets (Details) - USD ($)	Dec. 31, 2023	Dec. 31, 2022
Intangible assets	$ 673,148	$ 651,183
Less Accumulated amortization	(558,555)	(438,250)
Intangible assets, net	114,593	212,933
Customer Relationships [Member]
Intangible assets	489,273	473,308
Patents [Member]
Intangible assets	$ 183,874	$ 177,875

Note 7 - Intangible Assets - Ex

Note 7 - Intangible Assets - Expected Future Amortization Expense (Details) - USD ($)	Dec. 31, 2023	Dec. 31, 2022
2024	$ 72,902
2025	7,665
2026	7,665
2027	7,665
2028	7,665
Thereafter	11,031
Intangible assets, net	$ 114,593	$ 212,933

Note 8 - Lines of Credit (Detai

Note 8 - Lines of Credit (Details Textual) - Dec. 31, 2023	USD ($)	EUR (€)
Line of Credit Facility, Maximum Borrowing Capacity	$ 940,000	€ 850,000

Note 9 - Accounts Payable and_3

Note 9 - Accounts Payable and Accrued Liabilities - Schedule of Accounts Payable and Accrued Liabiltiies (Details) - USD ($)	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Accounts payable	$ 2,444,653	$ 1,389,355
Accrued payroll liabilities	1,223,712	510,727
Product warranty accrual	629,100	898,072	$ 962,313
Other accrued expenses	1,697,730	1,678,407
Total	$ 5,995,195	$ 4,476,561

Note 10 - Long-term Debt (Detai

Note 10 - Long-term Debt (Details Textual)				12 Months Ended
	Jun. 22, 2022 USD ($) $ / shares shares	Mar. 01, 2022 USD ($)	Apr. 08, 2021 USD ($) $ / shares shares	Dec. 31, 2023 USD ($) $ / shares	Dec. 31, 2022 USD ($) $ / shares	Oct. 13, 2023 USD ($)	Sep. 30, 2023 $ / shares shares	May 26, 2023 $ / shares
Stock Issued During Period, Shares, Issued for Commitment Fee (in shares) | shares			10,000
Common Stock, Par or Stated Value Per Share (in dollars per share) | $ / shares			$ 0.001	$ 0.001	$ 0.001			$ 0.001
Senior Promissory Notes Placement Agent Warrants [Member]
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares) | shares	28,846
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) | $ / shares	$ 5.2
Warrants and Rights Outstanding, Term (Year)	5 years
The 2023 Warrants [Member]
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares) | shares							531,250
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) | $ / shares							$ 5.2
Warrants and Rights Outstanding, Term (Year)							5 years
Senior Promissory Notes [Member]
Debt Instrument, Face Amount	$ 6,000,000			$ 6,000,000	$ 6,000,000
Interest Expense, Debt				0	0
Amortization of Debt Issuance Costs				400,903	176,063
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares) | shares	531,250
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) | $ / shares	$ 5.2
Warrants and Rights Outstanding, Term (Year)	5 years
Debt Instrument, Term (Month)	24 months
Debt Instrument, Interest Rate, Stated Percentage	10%
Debt Instrument, Stated Rate, Monthly Increase if Unpaid	1%
Debt Instrument, Unamortized Discount, Total	$ 695,749			1,311,989	519,686	$ 1,193,206
Senior Promissory Notes [Member] | Measurement Input, Expected Term [Member]
Debt Instrument, Measurement Input	2.5					5
Senior Promissory Notes [Member] | Measurement Input, Share Price [Member]
Debt Instrument, Measurement Input	3.44					3.89
Senior Promissory Notes [Member] | Measurement Input, Exercise Price [Member]
Debt Instrument, Measurement Input	5.2					5.2
Senior Promissory Notes [Member] | Measurement Input, Price Volatility [Member]
Debt Instrument, Measurement Input	0.808					73.66
Senior Promissory Notes [Member] | Measurement Input, Risk Free Interest Rate [Member]
Debt Instrument, Measurement Input	0.0313					4.6
Senior Promissory Notes [Member] | Measurement Input, Forfeiture Rate [Member]
Debt Instrument, Measurement Input	0					0
Senior Promissory Notes [Member] | Maximum [Member]
Debt Instrument, Interest Rate, Stated Percentage	16%
Convertible Debt [Member]
Debt Instrument, Face Amount			$ 15,000,000
Debt Instrument, Redemption Price, Percentage			112%
Debt Instrument, Convertible, Conversion Ratio			805.3992
Debt Instrument, Periodic Payment, Principal		$ 840,000
Debt Instrument, Redemption Covenant, Floor Price (in dollars per share) | $ / shares			$ 14
Repayments of Convertible Debt	$ 13,446,875
Repayments of Convertible Debt, Principal	11,640,000
Repayments of Convertible Debt, Premium	$ 1,806,875
Interest Expense, Debt				0	308,958
Amortization of Debt Issuance Costs				$ 0	$ 2,213,065

Note 10 - Long-term Debt - Note

Note 10 - Long-term Debt - Notes Payable (Details) - Senior Promissory Notes [Member] - USD ($)	Dec. 31, 2023	Oct. 13, 2023	Dec. 31, 2022	Jun. 22, 2022
Senior Promissory Notes	$ 6,000,000		$ 6,000,000	$ 6,000,000
Less: unamortized debt discount	(1,311,989)	$ (1,193,206)	(519,686)	$ (695,749)
Senior Promissory Notes payable	4,688,011		5,480,314
Current portion of Senior Promissory Notes payable	0		0
Senior Promissory Notes payable, less current portion	$ 4,688,011		$ 5,480,314

Note 11 - Agreements, Commitm_3

Note 11 - Agreements, Commitments and Contingencies (Details Textual)	12 Months Ended
	Dec. 31, 2023
Minimum [Member]
Standard Product Warranty, Term (Year)	1 year
Maximum [Member]
Standard Product Warranty, Term (Year)	3 years
Extended Product Warranty, Term (Year)	4 years

Note 11 - Agreements and Commit

Note 11 - Agreements and Commitments - Changes in Warranty Obligations (Details) - USD ($)	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Balance	$ 898,072	$ 962,313
Warranty costs charged to cost of goods sold	115,401	86,256
Utilization charges against reserve	(408,234)	(93,653)
Foreign currency effect	23,861	(56,844)
Balance	$ 629,100	$ 898,072

Note 12 - Income Taxes (Details

Note 12 - Income Taxes (Details Textual) - USD ($)	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Deferred Tax Assets, Valuation Allowance	$ 13,881,379	$ 12,445,765
LiqTech International AS and LiqTech Systems AS [Member]
Deferred Tax Assets, Valuation Allowance	6,303,000	5,226,000
LiqTech China [Member]
Deferred Tax Assets, Valuation Allowance	479,000	488,000
LiqTech International Inc and LiqTech NA [Member]
Deferred Tax Assets, Valuation Allowance	7,100,000	6,510,000
Domestic Tax Authority [Member] | Internal Revenue Service (IRS) [Member]
Operating Loss Carryforwards	29,136,593
Valuation Allowance, Deferred Tax Asset, Increase (Decrease), Amount	$ 590,000	1,146,000
Domestic Tax Authority [Member] | Internal Revenue Service (IRS) [Member] | Latest Tax Year [Member]
Operating Loss Carryforwards, Expiration Year	2041
Domestic Tax Authority [Member] | Danish Ministry of Taxation [Member]
Valuation Allowance, Deferred Tax Asset, Increase (Decrease), Amount	$ 1,077,000
Domestic Tax Authority [Member] | Chinese Ministry of Taxation [Member]
Valuation Allowance, Deferred Tax Asset, Increase (Decrease), Amount	9,000
Foreign Tax Authority [Member] | Danish Ministry of Taxation [Member]
Operating Loss Carryforwards	21,482,164
Valuation Allowance, Deferred Tax Asset, Increase (Decrease), Amount		1,720,000
Foreign Tax Authority [Member] | State Administration of Taxation, China [Member]
Operating Loss Carryforwards	$ 1,914,858
Foreign Tax Authority [Member] | Chinese Ministry of Taxation [Member]
Valuation Allowance, Deferred Tax Asset, Increase (Decrease), Amount		$ 295,000

Note 12 - Income Taxes - Deferr

Note 12 - Income Taxes - Deferred Tax Assets (Liabilities) (Details) - USD ($)	Dec. 31, 2023	Dec. 31, 2022
Excess of tax over financial accounting	$ 1,454,389	$ 973,859
Reserve for excess and obsolete inventory	190,841	145,910
Accrued interest	0	0
Discount amortization	724,353	640,163
Deferred compensation	0	0
Net operating loss carryover	11,580,458	11,057,361
Excess of book over tax depreciation	(359,917)	(272,243)
Excess of book over tax work in progress	190,196
Excess of book over tax work in progress		(253,930)
Valuation allowance	(13,881,379)	(12,445,765)
Deferred Tax Liabilities, Net	(101,059)	(154,645)
Long-term deferred tax asset	0	0
Long-term deferred tax liability	(101,059)	(154,645)
Deferred Income Tax Liabilities, Net	$ (101,059)	$ (154,645)

Note 12 - Income Taxes - Reconc

Note 12 - Income Taxes - Reconciliation of Income Tax Expense (Details) - USD ($)	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Computed tax at expected statutory rate	$ (1,843,244)	$ (3,025,369)
State and local income taxes, net of federal benefit	(1,177)	(1,532)
Non-US income taxed at different rates	(44,279)	(138,596)
Deferred compensation	0	52,500
Non-deductible expenses	5,399	2,749
Non-taxable income	0	(541)
Change in valuation allowance	1,755,013	3,035,205
Other	(77,919)	(161,826)
Total tax expense (benefit)	$ (206,207)	$ (237,410)

Note 12 - Income Taxes - Compon

Note 12 - Income Taxes - Components of Income Tax Expense (Benefit) from Continuing Operations (Details) - USD ($)	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Current income taxes:
Federal	$ 0	$ 0
State	0	0
Current tax (benefit)	0	0
Book in excess of tax depreciation	(386,673)	(346,154)
Work in progress	(442,964)	(294,233)
Net operating loss carryover	(402,448)	(2,041,211)
Valuation allowance	1,128,197	2,319,705
Deferred compensation	0	(52,500)
Accrued interest	0	(13,125)
Discount amortization	84,190	464,744
Accrued vacation	0	(4,305)
Reserve for obsolete inventory	(37,841)	(88,915)
Deferred tax expense (benefit)	(57,539)	(55,994)
Total tax expense (benefit)	(206,207)	(237,410)
Danish Ministry of Taxation [Member]
Current income taxes:
Danish	$ (148,668)	$ (181,417)

Note 13 - Earnings Per Share (D

Note 13 - Earnings Per Share (Details Textual) - shares	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Restricted Stock Units (RSUs) [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount (in shares)	314,461	301,111
Prefunded Warrants [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount (in shares)	3,390,008	3,930,008
Warrant [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount (in shares)	1,091,346	560,096

Note 14 - Stockholders' Equit_2

Note 14 - Stockholders' Equity (Details Textual)								1 Months Ended	12 Months Ended
	Sep. 12, 2023 USD ($) shares	Aug. 25, 2023 USD ($) shares	Jun. 26, 2023 USD ($) shares	May 26, 2023 $ / shares	Jan. 03, 2023 USD ($) shares	Jun. 23, 2022 USD ($) $ / shares shares	May 17, 2022 USD ($) $ / shares shares	May 30, 2023 shares	Dec. 31, 2023 USD ($) $ / shares shares	Dec. 31, 2022 USD ($) $ / shares shares	Dec. 31, 2013 USD ($)	Sep. 30, 2023 $ / shares shares	Apr. 08, 2021 $ / shares
Common Stock, Shares Authorized (in shares)									50,000,000	50,000,000
Common Stock, Par or Stated Value Per Share (in dollars per share) | $ / shares				$ 0.001					$ 0.001	$ 0.001			$ 0.001
Common Stock, Shares, Issued (in shares)									5,727,310	5,498,260
Preferred Stock, Shares Authorized (in shares)									2,500,000	2,500,000
Preferred Stock, Par or Stated Value Per Share (in dollars per share) | $ / shares									$ 0.001	$ 0.001
Preferred Stock, Shares Issued (in shares)									0	0
Stock Issued During Period, Shares, Reverse Stock Splits (in shares)								16,796
Shares Issued, Price Per Share (in dollars per share) | $ / shares										$ 0.5
Class of Warrant or Right, Issued During Period (in shares)									531,250	4,363,229
Common Stock, Shares, Outstanding, Ending Balance (in shares)									5,727,310	5,498,260
Restricted Stock Units (RSUs) [Member]
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Grants in Period (in shares)									225,604
Share-Based Payment Arrangement, Expense | $									$ 627,904	$ 934,423
Share-Based Payment Arrangement, Nonvested Award, Excluding Option, Cost Not yet Recognized, Amount | $									$ 688,990
Restricted Stock Units (RSUs) [Member] | The 2022 Incentive Plan [Member]
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Grants in Period (in shares)									201,104
Public Offering [Member]
Shares Issued, Price Per Share (in dollars per share) | $ / shares							$ 4
Private Placement [Member]
Proceeds from Issuance of Debt | $						$ 6,000,000
Warrant Purchase Agreement [Member]
Common Stock, Par or Stated Value Per Share (in dollars per share) | $ / shares							$ 0.008
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares)							3,803,133
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) | $ / shares							$ 3.992
Proceeds from Issuance or Sale of Equity, Total | $							$ 15,182,075
Private Placement Warrants [Member]
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares)						531,250
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) | $ / shares						$ 5.2
Class of Warrant or Right, Issued During Period (in shares)						28,846
The 2023 Warrants [Member]
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares)												531,250
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) | $ / shares												$ 5.2
Warrants and Rights Outstanding, Term (Year)												5 years
Director [Member]
Stock Issued During Period, Shares, Restricted Stock Award, Net of Forfeitures (in shares)		1,042	24,500		2,340
Stock Issued During Period, Value, Restricted Stock Award, Net of Forfeitures | $		$ 57,500	$ 73,500		$ 110,254
Director [Member] | Restricted Stock Units (RSUs) [Member]
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Grants in Period (in shares)									113,357
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Annual Grant | $											$ 36,750
Management [Member]
Stock Issued During Period, Shares, Restricted Stock Award, Net of Forfeitures (in shares)	26,042				158,330
Stock Issued During Period, Value, Restricted Stock Award, Net of Forfeitures | $	$ 116,667				$ 674,164
Board of Directors Chairman [Member] | Restricted Stock Units (RSUs) [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Annual Grant | $											$ 73,500
Reverse Stock Split [Member]
Stockholders' Equity Note, Stock Split, Conversion Ratio				8
Convertible Preferred Stock [Member]
Preferred Stock, Shares Issued (in shares)									0
Preferred Stock, Shares Outstanding (in shares)										0

Note 14 - Stockholders' Equit_3

Note 14 - Stockholders' Equity - Warrants (Details) - shares	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Balance, Warrants (in shares)	4,490,104	126,875
Warrants issued in connection with public offering and private placement (in shares)	531,250	4,363,229
Common stock exchanged to prefunded warrant (in shares)	0	0
Balance, Warrants (in shares)	5,021,354	4,490,104

Note 14 - Stockholders' Equit_4

Note 14 - Stockholders' Equity - Share Incentive Plan Activity (Details) - Restricted Stock Units (RSUs) [Member] - USD ($)	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Outstanding, units (in shares)	301,111
Outstanding, weighted average grant-date fair value (in dollars per share)	$ 4.8
Outstanding, aggregated intrinsic value	$ 0	$ 0
Granted, units (in shares)	225,604
Granted, weighted average grant-date fair value (in dollars per share)	$ 3
Vested and settled with share issuance, units (in shares)	(212,254)
Vested and settled with share issuance, weighted average grant-date fair value (in dollars per share)	$ (4.86)
Outstanding, December 31, 2023 (in shares)	314,461
Outstanding, December 31, 2023 (in dollars per share)	$ 3.46

Note 15 - Segment Reporting - S

Note 15 - Segment Reporting - Summary of Segment Activity (Details) - USD ($)	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Revenue	$ 18,001,652	$ 15,982,438
Net Income (Loss)	(8,571,145)	(14,169,107)
Segment assets	35,971,847	40,125,655
Water Segment [Member]
Revenue	7,705,080	5,297,286
Net Income (Loss)	(736,148)	(1,072,530)
Segment assets	9,432,991	7,781,211
Water Segment [Member] | Operating Segments [Member]
Revenue	7,705,080	5,297,286
Ceramics Segment [Member]
Revenue	6,232,628	6,844,861
Net Income (Loss)	(2,640,894)	(4,648,768)
Segment assets	14,550,872	13,808,529
Ceramics Segment [Member] | Operating Segments [Member]
Revenue	6,232,628	6,844,861
Plastics Segment [Member]
Revenue	3,736,529	3,528,606
Plastics Segment [Member] | Operating Segments [Member]
Revenue	3,736,529	3,528,606
Plastic Products [Member]
Net Income (Loss)	(660,896)	(794,942)
Segment assets	759,745	1,099,019
Other Segments [Member]
Net Income (Loss)	(4,533,206)	(7,652,867)
Segment assets	11,228,239	17,436,896
Other Segments [Member] | Operating Segments [Member]
Revenue	$ 327,415	$ 311,685

Note 16 - Significant Custome_3

Note 16 - Significant Customers / Concentration (Details Textual) - Geographic Concentration Risk [Member] - Assets, Total [Member]	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
DENMARK
Concentration Risk, Percentage	98%	65%
UNITED STATES
Concentration Risk, Percentage	0%	33%
CHINA
Concentration Risk, Percentage	2%	2%

Note 16 - Significant Custome_4

Note 16 - Significant Customers / Concentration / Disaggregated Revenue - Concentration of Risk (Details) - Customer Concentration Risk [Member]	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Revenue Benchmark [Member] | Customer A [Member]
Concentration Risk, Percentage	0%	13%
Accounts Receivable [Member] | Customer B [Member]
Concentration Risk, Percentage	22%	17%
Accounts Receivable [Member] | Customer C [Member]
Concentration Risk, Percentage	13%	0%
Accounts Receivable [Member] | Customer D [Member]
Concentration Risk, Percentage	0%	20%
Accounts Receivable [Member] | Customer E [Member]
Concentration Risk, Percentage	0%	10%

Note 17 - Subsequent Events (De

Note 17 - Subsequent Events (Details Textual) - Subsequent Event [Member]	Jan. 03, 2024 USD ($) shares
Board of Directors Chairman [Member]
Stock Issued During Period, Shares, Issued for Services (in shares) | shares	24,500
Stock Issued During Period, Value, Issued for Services | $	$ 73,500
Management [Member]
Stock Issued During Period, Shares, Issued for Services (in shares) | shares	55,530
Stock Issued During Period, Value, Issued for Services | $	$ 181,142

Schedule II - Valuation and Qua

Schedule II - Valuation and Qualifying Accounts - Bad Debt Expense and Reserves for Obsolete Inventory (Details) - USD ($)	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Bad debt expense	$ 82,066	$ (24,534)
SEC Schedule, 12-09, Reserve, Inventory [Member]
Bad debt expense	82,066	(24,534)
Inventory Write-down	$ 177,953	$ 404,160

Schedule II - Valuation and Q_2

Schedule II - Valuation and Qualifying Accounts - Valuation and Qualifying Accounts (Details) - USD ($)		12 Months Ended
		Dec. 31, 2023	Dec. 31, 2022
Balance Beginning of Year		$ 722,786	$ 677,546
Charges to Costs and Expenses		260,019	379,626
Deductions	[1]	19,565	(334,386)
Balance End of Year		1,002,370	722,786
SEC Schedule, 12-09, Reserve, Inventory [Member]
Balance Beginning of Year		663,227	268,470
Charges to Costs and Expenses		177,953	404,160
Deductions	[1]	26,278	(9,403)
Balance End of Year		867,458	663,227
SEC Schedule, 12-09, Allowance, Credit Loss [Member]
Balance Beginning of Year		59,559	409,076
Charges to Costs and Expenses		82,066	(24,534)
Deductions	[1]	(6,713)	(324,983)
Balance End of Year		$ 134,912	$ 59,559
[1]Includes write-offs, the impact of foreign currency exchange rates.

Schedule II - Valuation and Q_3

Schedule II - Valuation and Qualifying Accounts - Rollforward for Allowance for Doubtful Accounts (Details) - USD ($)	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Allowance for doubtful accounts	$ 59,559	$ 409,076
Bad debt expense	82,066	(24,534)
Receivables written off during the periods	(10,298)	(295,778)
Effect of currency translation	3,585	(29,205)
Allowance for doubtful accounts	134,912	59,559
SEC Schedule, 12-09, Allowance, Credit Loss [Member]
Allowance for doubtful accounts	59,559	409,076
Bad debt expense	82,066	(24,534)
Receivables written off during the periods	(10,298)	(295,778)
Effect of currency translation	3,585	(29,205)
Allowance for doubtful accounts	$ 134,912	$ 59,559