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Note 1 - Summary of Significant Accounting Policies (Tables)

6 Months Ended

Jun. 30, 2020

Notes Tables

Financing Receivable, Allowance for Credit Loss [Table Text Block]

		June 30, 2020				December 31, 2019
Allowance for doubtful accounts at the beginning of the period		$	612,434			$	971,772
Bad debt expense			327				25,044
Receivables written off during the periods			(459,207	)			(362,244	)
Effect of currency translation			(6,305	)			(22,138	)
Allowance for doubtful accounts at the end of the period		$	147,250			$	612,434

Schedule of Revenue from External Customers Attributed to Foreign Countries by Geographic Area [Table Text Block]

		For the Three Months								For the Six Months
		Ended June 30,								Ended June 30,
		2020				2019				2020				2019
United States and Canada		$	307,480			$	255,642			$	433,962			$	688,229
Australia			61,706				153,401				103,961				215,514
South America			12,043				-				22,939				-
Asia			292,756				933,693				2,326,044				2,172,807
Europe			3,967,498				7,954,450				12,036,421				13,641,834
		$	4,641,483			$	9,297,186			$	14,923,327			$	16,718,384

Reconciliation of Revenue from Segments to Consolidated [Table Text Block]

		For the Three Months								For the Six Months
		Ended June 30,								Ended June 30,
		2020				2019				2020				2019
Liquid filters and systems		$	2,551,710			$	8,453,136			$	10,531,998			$	13,493,469
Diesel particulate filters			1,160,695				747,234				2,720,757				2,990,502
Plastic components			762,384				-				1,343,794				-
Development projects			166,694				96,815				326,778				234,413
		$	4,641,483			$	9,297,186			$	14,923,327			$	16,718,384

Contract with Customer, Contract Asset, Contract Liability, and Receivable [Table Text Block]

		June 30, 2020				December 31, 2019
Cost incurred		$	4,305,503			$	3,960,199
Unbilled project deliveries			1,805,884				1,971,106
VAT			397,949				862,368
Other receivables			114,036				58,397
Prepayments			(2,330,373	)			(1,732,231	)
Deferred Revenue			(1,093,114	)			(876,286	)
		$	3,199,885			$	4,243,553
Distributed as follows:
Contract assets		$	4,523,130			$	5,664,929
Contract liabilities			(1,323,245	)			(1,421,376	)
		$	3,199,885			$	4,243,553

Fair Value, Assets Measured on Recurring Basis [Table Text Block]

		Fair value at reporting date using:
		June 30, 2020				Quoted Prices in Active Markets for Identical Assets (Level 1)				Significant Other Observable Inputs (Level 2)				Significant Unobservable Inputs (Level 3)
Contingent Earn-out Liability		$	901,537			$	-			$	-			$	901,537
Prefunded warrants			2,811,900				2,811,900				-				-

Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Table Text Block]

Balance at December 31, 2019		$	898,755
Foreign currency effect			2,782
Balance at June 30, 2020		$	901,537

Schedule of Stockholders' Equity Note, Warrants or Rights Activity [Table Text Block]

Base value of warrants, 515,000 warrants at $5		$	2,575,000
Fair value adjustment			236,900
Balance at June 30, 2020		$	2,811,900

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