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Note 8 - Income (Loss) Per Common Share - Reconciliation of Weighted Average Shares Outstanding Used in Calculation of Basic and Diluted (Loss) Earnings Per Common Share (Details) - USD ($)
 3 Months Ended 9 Months Ended
Oct. 02, 2016
Oct. 04, 2015
Oct. 02, 2016
Oct. 04, 2015
Net income (loss) as reported $ 20,993,000 $ (274,000) $ 10,691,000 $ (21,723,000)
Less distributed and undistributed earnings allocable to restricted award holders (737,000) 0 (331,000) 0
Net income (loss) allocable to common stockholders $ 20,256,000 $ (274,000) $ 10,360,000 $ (21,723,000)
Basic (in dollars per share) $ 1.02 $ (0.01) $ 0.52 $ (1.10)
Diluted (in dollars per share) $ 1.02 $ (0.01) $ 0.52 $ (1.10)
Weighted average shares outstanding – basic (in shares) 19,834,000 19,654,000 19,761,000 19,684,000
Weighted average additional shares assuming conversion of potential common shares (in shares) 0 0 0 0
Weighted average shares outstanding – diluted (in shares) 19,834,000 19,654,000 19,761,000 19,684,000