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Note 2 - Revenue Recognition (Tables)

12 Months Ended

Dec. 31, 2022

Notes Tables

Disaggregation of Revenue [Table Text Block]

		Twelve Months Ended December 31,
		2022				2021
Air Pollution Control
Technology solutions		$	7,935			$	4,189
Spare parts			911				1,138
Ancillary revenue			1,751				1,569
Total Air Pollution Control technology			10,597				6,896
FUEL CHEM
FUEL CHEM technology solutions			16,344				17,365
Total Revenues		$	26,941			$	24,261

Revenue from External Customers by Geographic Areas [Table Text Block]

		Twelve Months Ended December 31,
		2022				2021
United States		$	20,311			$	19,515
Foreign Revenues
Americas			213				356
Europe			2,888				1,894
Asia			3,529				2,496
Total Foreign Revenues			6,630				4,746
Total Revenues		$	26,941			$	24,261

Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Table Text Block]

		Twelve Months Ended December 31,
		2022				2021
Products transferred at a point in time		$	18,849			$	20,072
Products and services transferred over time			8,092				4,189
Total Revenues		$	26,941			$	24,261

Schedule of Accounts, Notes, Loans and Financing Receivable [Table Text Block]

		As of
		December 31, 2022				December 31, 2021
Trade receivables		$	4,605			$	2,122
Unbilled receivables			3,082				1,277
Other short-term receivables			152				83
Allowance for doubtful accounts			(110	)			(223	)
Total accounts receivable		$	7,729			$	3,259

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