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Note 7 - 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
Apr. 05, 2020
Mar. 31, 2019
Net loss as reported $ (305) $ (3,036)
Less distributed and undistributed earnings allocable to restricted awarded holders 0 0
Less dividends declared attributed to restricted awarded holders 0 0
Net loss allocable to common stockholders $ (305) $ (3,036)
Basic (in dollars per share) $ (0.01) $ (0.15)
Diluted (in dollars per share) $ (0.01) $ (0.15)
Basic (in shares) 20,988 20,669
Weighted average additional shares assuming conversion of potential common shares (in shares) 0 0
Weighted average shares outstanding – diluted (in shares) 20,988 20,669