Note 7 - Share-based Compensation (Tables)

6 Months Ended

Jun. 30, 2021

Notes Tables

Share-based Payment Arrangement, Expensed and Capitalized, Amount [Table Text Block]

	Three Months Ended June 30,				Six Months Ended June 30,
	2021		2020		2021		2020
Cost of sales	$	253	$	179	$	483	$	321
Selling, general, and administrative expense		890		794		1,357		1,112
Total	$	1,143	$	973	$	1,840	$	1,433

Schedule of Unvested Restricted Stock Units and Performance Share Awards Activity [Table Text Block]

	Number of RSUs and PSAs (1)			Weighted- Average Grant Date Fair Value
Unvested RSUs and PSAs as of December 31, 2020		129,572		$	25.86
RSUs and PSAs granted		90,368			33.30
RSUs and PSAs vested (2)		(58,809	)		25.53
Unvested RSUs and PSAs as of June 30, 2021		161,131			30.26