Note 8 - Stockholders' Equity - Reconciliation of Activity in Stockholders' Equity Accounts (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Apr. 01, 2017	Mar. 31, 2017
Balance	$ 12,235
Net loss	(3,367)	$ (416)	$ (416)
Settlement of employee benefit obligations directly related to the disposal transaction	2,422
Balance	11,439
Common Stock [Member]
Balance	298
Net loss
Settlement of employee benefit obligations directly related to the disposal transaction
Stock repurchase
Stock-based compensation expense
Dividends
Balance	298
Additional Paid-in Capital [Member]
Balance	17,104
Net loss
Settlement of employee benefit obligations directly related to the disposal transaction
Stock repurchase	(103)
Stock-based compensation expense	391
Dividends	(139)
Balance	17,253
Retained Earnings [Member]
Balance	(2,745)
Net loss	(3,367)
Settlement of employee benefit obligations directly related to the disposal transaction
Stock repurchase
Stock-based compensation expense
Dividends
Balance	(6,112)
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