Note 3 - Revenue

3 Months Ended

Mar. 31, 2024

Notes to Financial Statements

Revenue from Contract with Customer [Text Block]

3.     Revenue

Disaggregated Revenue by Product Technology

The following table presents our revenues disaggregated by product technology:

	Three Months Ended
	March 31,
	2024		2023
Air Pollution Control
Technology solutions	$	1,664	$	2,982
Spare parts		199		174
Ancillary revenue		455		403
Total Air Pollution Control technology revenues		2,318		3,559
FUEL CHEM
FUEL CHEM technology solutions		2,639		3,728
Total Revenues	$	4,957	$	7,287

Disaggregated Revenue by Geography

The following table presents our revenues disaggregated by geography, based on the location of the end-user:

	Three Months Ended
	March 31,
	2024		2023
United States	$	3,595	$	5,981
Foreign Revenues
Latin America		315		—
Europe		856		579
Asia		191		727
Total Foreign Revenues		1,362		1,306
Total Revenues	$	4,957	$	7,287

Timing of Revenue Recognition

The following table presents the timing of our revenue recognition:

	Three Months Ended
	March 31,
	2024		2023
Products transferred at a point in time	$	3,293	$	4,305
Products and services transferred over time		1,664		2,982
Total Revenues	$	4,957	$	7,287

Contract Balances

The timing of revenue recognition, billings, and cash collections results in billed accounts receivable, unbilled receivables (contract assets), and customer advances and deposits (contract liabilities) on the Condensed Consolidated Balance Sheets. In our Air Pollution Control (APC) technology segment, amounts are billed as work progresses in accordance with agreed-upon contractual terms. Generally, billing occurs subsequent to revenue recognition, resulting in contract assets. For the FUEL CHEM technology segment, deliveries made in the current period but billed in subsequent periods are also considered contract assets. These assets are reported on the Condensed Consolidated Balance Sheets on a contract-by-contract basis at the end of each reporting period. At March 31, 2024,  December 31, 2023, and December 31, 2022, contract assets for APC technology projects were approximately $1,507, $2,285, and $3,082, respectively. There were no contract assets for the FUEL CHEM technology segment as of  March 31, 2024,  December 31, 2023, and December 31, 2022.  

The Company will periodically bill in advance of costs incurred before revenue is recognized, resulting in contract liabilities. These liabilities are reported on the Condensed Consolidated Balance Sheets on a contract-by-contract basis at the end of each reporting period. Contract liabilities were $761, $1,279, and $372 at March 31, 2024,  December 31, 2023, and December 31, 2022, respectively, and are included in other accrued liabilities on the Condensed Consolidated Balance Sheets.

Changes in the contract asset and liability balances during the three-month period ended March 31, 2024 were not materially impacted by any other items other than amounts billed and revenue recognized as described previously. Revenue recognized that was included in the contract liability balance at the beginning of the period was $1,121 for the three months ended March 31, 2024 and $359 for the three months ended March 31, 2023, which represented primarily revenue from progress towards completion of our APC technology contracts.

As of March 31, 2024 and December 31, 2023, we had no construction contracts in progress that were identified as a loss contract. 

Remaining Performance Obligations

Remaining performance obligations represents the transaction price of APC technology booked orders for which work has not been performed. As of March 31, 2024, the aggregate amount of the transaction price allocated to remaining performance obligations was $6,181. The Company expects to recognize revenue on approximately $6,019 of the remaining performance obligations over the next 12 months with the remaining recognized thereafter. 

Accounts Receivable

The components of accounts receivable are as follows:

	As of
	March 31, 2024			December 31, 2023
Trade receivables	$	3,769		$	4,300
Unbilled receivables		1,507			2,285
Receivable for employee retention credit		1,677			—
Other short-term receivables		262			255
Allowance for credit losses		(111	)		(111	)
Total accounts receivable	$	7,104		$	6,729