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Note 1 - Summary of Significant Accounting Policies (Tables)

6 Months Ended

Jun. 30, 2022

Notes Tables

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

		June 30, 2022				December 31, 2021
Allowance for doubtful accounts at the beginning of the period		$	409,076			$	498,044
Bad debt expense			73,749				(28,499	)
Receivables written off during the periods			(307,885	)			(24,415	)
Effect of currency translation			(22,629	)			(36,054	)
Allowance for doubtful accounts at the end of the period		$	152,311			$	409,076

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,
		2022				2021				2022				2021
Americas		$	339,380			$	196,207			$	478,688			$	361,795
Asia-Pacific			1,213,389				1,459,032				2,048,753				2,589,068
Europe			2,084,570				2,361,324				4,747,134				5,063,577
Middle East & Africa			1,380,953				-				1,380,953				-
		$	5,018,292			$	4,016,563			$	8,655,528			$	8,014,440

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

		For the Three Months								For the Six Months
		Ended June 30,								Ended June 30,
		2022				2021				2022				2021
Liquid filters and systems		$	2,144,011			$	1,080,004			$	2,737,002			$	2,237,340
Diesel particulate filters			1,812,334				1,810,743				3,692,452				3,741,807
Plastic components			1,035,705				1,016,370				2,174,302				1,830,396
Development projects			26,242				109,446				51,772				204,897
		$	5,018,292			$	4,016,563			$	8,655,528			$	8,014,440

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

		June 30, 2022				December 31, 2021
Cost incurred		$	3,448,036			$	3,381,994
Unbilled project deliveries			938,041				454,158
VAT			676,610				542,255
Other receivables			61,873				60,158
Prepayments			(2,675,339	)			(2,947,736	)
Deferred Revenue			(258,308	)			(499,146	)
		$	2,190,913			$	991,682
Distributed as follows:
Contract assets		$	2,786,063			$	1,906,510
Contract liabilities			(595,150	)			(914,828	)
		$	2,190,913			$	991,682

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- Definition

Tabular disclosure of allowance for credit loss on financing receivable.

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