Note 4 - Receivables and Allowance for Credit Losses (Tables)

3 Months Ended

Mar. 31, 2021

Notes Tables

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

	March 31,			December 31,
	2021			2020
Accounts receivable–trade	$	30,542		$	26,912
Less allowance for credit losses		(524	)		(484	)
Receivables, net	$	30,018		$	26,428

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

	Allowance for Credit Losses
	Three Months Ended March 31,
	2021			2020
Allowance - beginning of period	$	484		$	486
Provision for expected credit losses		48			60
Amounts written off against the allowance		(8	)		(5	)
Allowance - end of period	$	524		$	541