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Note 10 - Loss Per Common Share - Reconciliation of Weighted Average Shares Outstanding Used in Calculation of Basic and Diluted (Loss) Earnings Per Common Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Oct. 01, 2017	Sep. 30, 2018	Oct. 01, 2017
Net loss	$ (2,336)	$ (3,133)	$ (3,317)	$ (9,588)
Less distributed and undistributed earnings allocable to restricted award holders	0	0	0	0
Net loss allocable to common stockholders	$ (2,336)	$ (3,133)	$ (3,317)	$ (9,588)
Basic (in dollars per share)	$ (0.11)	$ (0.15)	$ (0.16)	$ (0.47)
Diluted (in dollars per share)	$ (0.11)	$ (0.15)	$ (0.16)	$ (0.47)
Basic (in shares)	20,555	20,397	20,497	20,305
Weighted average additional shares assuming conversion of potential common shares (in shares)	0	0	0	0
Weighted average shares outstanding – diluted (in shares)	20,555	20,397	20,497	20,305

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The amount of net income (loss) for the period per each share of common stock or unit outstanding during the reporting period.

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