Note 2 - Allowance for Doubtful Accounts Receivable (Tables)

12 Months Ended

Dec. 31, 2019

Notes Tables

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

	Years Ended December 31,
	2019			2018			2017
Balance at the beginning of year	$	2,042		$	1,382		$	1,276
Provision for bad debts		1,323			867			1,002
Charge-offs		(401	)		(210	)		(901	)
Recoveries		-			3			5
Balance at the end of year	$	2,964		$	2,042		$	1,382