Note 6 - Stockholders' Equity - Reconciliation of Activity in Stockholders' Equity Accounts (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jul. 01, 2017	Jul. 02, 2016	Jul. 02, 2017	Jul. 01, 2017	Jul. 02, 2016
Balance			$ 19,982	$ 19,982
Net loss	$ 14	$ (1,392)		(402)	$ (2,877)
Adjustment to net periodic benefit cost	25	$ 24		50	$ 47
Balance	$ 19,698			19,698
Common Stock [Member]
Balance			275	275
Net loss
Dividend payable adjustment due to restricted share forfeitures
Stock-based compensation
Adjustment to net periodic benefit cost
Balance			275
Additional Paid-in Capital [Member]
Balance			16,840	16,840
Net loss
Dividend payable adjustment due to restricted share forfeitures
Stock-based compensation			(66)
Adjustment to net periodic benefit cost
Balance			16,774
Retained Earnings [Member]
Balance			5,129	5,129
Net loss			(402)
Dividend payable adjustment due to restricted share forfeitures			134
Stock-based compensation
Adjustment to net periodic benefit cost
Balance			4,861
AOCI Attributable to Parent [Member]
Balance			(2,262)	$ (2,262)
Net loss
Dividend payable adjustment due to restricted share forfeitures
Stock-based compensation
Adjustment to net periodic benefit cost			50
Balance			$ (2,212)