Note 1 - Summary of Significant Accounting Policies (Tables)

12 Months Ended

Dec. 31, 2016

Notes Tables

Schedule of Deferred Compensation Plan [Table Text Block]

	December 31,
	2016		2015
Cash surrender value of corporate-owned life insurance policies	$	8,180	$	5,706
Fair value of mutual funds		12,108		8,279
Total deferred compensation plan assets	$	20,288	$	13,985
Deferred compensation plan assets reported in:
Other long-term assets	$	20,288	$	13,985
Deferred compensation plan liabilities reported in:
Accrued compensation and related benefits (short-term)	$	479	$	-
Other long-term liabilities		19,836		14,147
Total	$	20,315	$	14,147