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Note 1 - Summary of Significant Accounting Policies (Tables)

3 Months Ended

Mar. 31, 2022

Notes Tables

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

		March 31, 2022				December 31, 2021
Allowance for doubtful accounts at the beginning of the period		$	409,076			$	498,044
Bad debt expense			(88,776	)			(28,499	)
Receivables written off during the periods			-				(24,415	)
Effect of currency translation			(7,623	)			(36,054	)
Allowance for doubtful accounts at the end of the period		$	312,677			$	409,076

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

										For the Three months ended
		% Distribution								March 31,
		2022				2021				2022				2021
North America			4	%			4	%		$	139,307			$	165,588
Australia			1	%			1	%			35,399				32,141
Asia			22	%			28	%			799,965				1,157,155
Europe			73	%			67	%			2,662,564				2,642,993
			100	%			100	%		$	3,637,236			$	3,997,877

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

										For the Three Months
		% Distribution								Ended March 31,
		2022				2021				2022				2021
Liquid filters and systems			16	%			30	%		$	592,990			$	1,157,336
Diesel particulate filters			52	%			48	%			1,880,118				1,931,064
Plastic components			31	%			20	%			1,138,597				814,025
Development projects			1	%			2	%			25,530				95,452
			100	%			100	%		$	3,637,236			$	3,997,877

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

		March 31, 2022				December 31, 2021
Cost incurred		$	3,980,616			$	3,381,994
Unbilled project deliveries			282,135				454,158
VAT			413,204				542,255
Other receivables			324,714				60,158
Prepayments			(2,912,111	)			(2,947,736	)
Deferred Revenue			(343,273	)			(499,146	)
		$	1,745,284			$	991,682
Distributed as follows:
Contract assets		$	2,437,924			$	1,906,510
Contract liabilities			(692,640	)			(914,828	)
		$	1,745,284			$	991,682

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Tabular disclosure of allowance for credit loss on financing receivable.

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