Note 10 - Fair Value Measurements (Tables)

6 Months Ended

Jun. 30, 2019

Notes Tables

Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Table Text Block]

	Level 1		Level 2		Level 3		Total
June 30 , 2019
Corporate bonds and notes	$	—	$	5,845	$	—	$	5,845
Municipal bonds		—		4,101		—		4,101
Total	$	—	$	9,946	$	—	$	9,946
December 31, 2018
Corporate bonds and notes	$	—	$	2,881	$	—	$	2,881
Municipal bonds		—		1,834		—		1,834
Total	$	—	$	4,715	$	—	$	4,715