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Note 1 - Summary of Significant Accounting Policies (Tables)

3 Months Ended

Mar. 31, 2020

Notes Tables

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

		March 31, 20 20				December 31, 201 9
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			(327	)			(362,244	)
Effect of currency translation			(12,571	)			(22,138	)
Allowance for doubtful accounts at the end of the period		$	599,863			$	612,434

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

		For the Three months e nded March 31
		20 20				201 9
United States and Canada		$	126,482			$	113,059
Australia			42,255				62,113
South America			10,896				319,528
Asia			2,033,288				1,239,113
Europe			8,068,923				5,687,385
		$	10,281,844			$	7,421,198

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

		For the Three months e nded March 31
		20 20				201 9
Ceramic diesel particulate		$	1,560,062			$	2,243,268
Liquid filters and systems			7,980,287				5,040,333
Plastics			581,411				-
Development projects			160,084				137,597
		$	10,281,844			$	7,421,198

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

		March 31, 2020				December 31, 2019
Cost incurred		$	3,795,520			$	3,960,199
Unbilled project deliveries			2,386,541				1,971,106
VAT			626,621				862,368
Other receivables			97,082				58,397
Prepayments			(1,964,914	)			(1,732,231	)
Deferred Revenue			(1,155,405	)			(876,286	)
		$	3,785,445			$	4,243,553
Distributed as follows:
Contract Assets		$	5,137,111			$	5,664,929
Contract Liabilities			(1,351,666	)			(1,421,376	)
		$	3,785,445			$	4,243,553

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

		Fair value at reporting date using:
		March 31, 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		$	880,308			$	-			$	-			$	880,308

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

Balance at December 31, 2019		$	898,755
Foreign currency effect			(18,447	)
Balance at March 31, 2020		$	880,308

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Tabular disclosure of allowance for credit loss on financing receivable.

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