Note 2 - Allowance for Doubtful Accounts Receivable (Tables)

12 Months Ended

Dec. 31, 2020

Notes Tables

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

	Years Ended December 31,
	2020			2019			2018
Balance at the beginning of year	$	2,964		$	2,042		$	1,382
Provision for bad debts		6,746			1,323			867
Charge-offs		(2,087	)		(401	)		(210	)
Recoveries		44			-			3
Balance at the end of year	$	7,667		$	2,964		$	2,042