Note 3 - Trade Accounts Receivable (Tables)

12 Months Ended

Dec. 31, 2021

Notes Tables

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

	2021			2020
	(in thousands)
Billed	$	105,992		$	68,584
Unbilled		20,388			12,629
Current estimated credit losses		(4,526	)		(3,482	)
Total accounts receivable—net	$	121,854		$	77,731

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

	2021		2020		2019
	(in thousands)
Balance—beginning of year	$	3,482	$	2,952	$	2,224
Provision for bad debts		1,044		530		728
Charge-offs		-		-		-
Recoveries		-		-		-
Balance—end of year	$	4,526	$	3,482	$	2,952