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Note 1 - Summary of Significant Accounting Policies (Tables)

9 Months Ended

Sep. 30, 2022

Notes Tables

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

		September 30, 2022				December 31, 2021
Allowance for doubtful accounts at the beginning of the period		$	409,076			$	498,044
Bad debt expense			91,519				(28,499	)
Receivables written off during the periods			(298,850	)			(24,415	)
Effect of currency translation			(40,434	)			(36,054	)
Allowance for doubtful accounts at the end of the period		$	161,311			$	409,076

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

		For the Three Months								For the Nine Months
		Ended September 30,								Ended September 30,
		2022				2021				2022				2021
Americas		$	382,573			$	211,575			$	861,260			$	573,365
Asia-Pacific			895,696				636,622				2,944,449				3,225,691
Europe			1,903,930				3,294,757				6,651,065				8,358,338
Middle East & Africa			123,335				-				1,504,288				-
		$	3,305,534			$	4,142,954			$	11,961,062			$	12,157,394

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

		For the Three Months								For the Nine Months
		Ended September 30,								Ended September 30,
		2022				2021				2022				2021
Water		$	785,046			$	1,493,549			$	3,522,049			$	3,730,889
Ceramics			1,854,981				1,703,057				5,548,951				5,444,863
Plastics			665,507				855,896				2,839,809				2,686,292
Corporate			-				90,452				50,253				295,350
		$	3,305,534			$	4,142,954			$	11,961,062			$	12,157,394

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

		September 30, 2022				December 31, 2021
Cost incurred		$	3,602,967			$	3,381,994
Unbilled project deliveries			667,670				454,158
VAT			383,701				542,255
Other receivables			9,240				60,158
Prepayments			(3,082,635	)			(2,947,736	)
Deferred Revenue			(137,638	)			(499,146	)
		$	1,443,305			$	991,682
Distributed as follows:
Contract assets		$	2,078,472			$	1,906,510
Contract liabilities			(635,167	)			(914,828	)
		$	1,443,305			$	991,682

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Tabular disclosure of allowance for credit loss on financing receivable.

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