Note 7 - Stockholders' Equity - Reconciliation of Activity in Stockholders' Equity Accounts (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jul. 01, 2017	Jun. 30, 2018	Jul. 01, 2017
Balance			$ 12,485
Net loss	$ 313	$ 14	(3,054)	$ (402)
Settlement of employee benefit obligations directly related to the disposal transaction			2,422
Balance	11,986		11,986
Common Stock [Member]
Balance			298
Net loss
Settlement of employee benefit obligations directly related to the disposal transaction
Stock repurchase			(4)
Stock-based compensation expense
Dividends
Balance	294		294
Additional Paid-in Capital [Member]
Balance			17,104
Net loss
Settlement of employee benefit obligations directly related to the disposal transaction
Stock repurchase			(129)
Stock-based compensation expense			405
Dividends			(139)
Balance	17,241		17,241
Retained Earnings [Member]
Balance			(2,495)
Net loss			(3,054)
Settlement of employee benefit obligations directly related to the disposal transaction
Stock repurchase
Stock-based compensation expense
Dividends
Balance	(5,549)		(5,549)
AOCI Attributable to Parent [Member]
Balance			(2,422)
Net loss
Settlement of employee benefit obligations directly related to the disposal transaction			2,422
Stock repurchase
Stock-based compensation expense
Dividends
Balance