Note 8 - Income Taxes - Reconciliation of Income Tax Computed at U.S. Federal Statutory Tax Rate to Provision (Benefit) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 29, 2018	Dec. 30, 2017	Dec. 31, 2016
Tax provision at U.S. 21% statutory rate (35% in 2017 & 2016)	$ (6,702)	$ 12,378	$ 2,102
Impact of Tax Act, before reduction in valuation allowance	5,095	12,397
State income taxes, net of federal tax benefit	(663)	56	168
Settlements, adjustments and releases from statute expirations	(783)	(1,731)	(312)
Federal tax credits	(864)	(371)	(183)
Stock-based compensation	(838)	(2,801)	168
Executive compensation limited by Section 162(m)	3,456	246
Change in valuation allowance	(2,015)	(13,484)	2,430
Non-deductible transaction related costs	1,106	331	463
GILTI	3,531
Foreign rate differential	(435)	(4,866)	(2,378)
Other, net	(257)	89	289
	$ 631	$ 2,244	$ 2,747