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Note 4 - Summary of Plans Related to Unvested Restricted Stock (Details)
6 Months Ended
Jul. 02, 2016
$ / shares
shares
Restricted Stock [Member]  
Outstanding, January 2, 2016 (in shares) | shares 276,553
Outstanding, January 2, 2016 (in dollars per share) | $ / shares $ 11.93
Granted (in shares) | shares 200,547
Granted (in dollars per share) | $ / shares $ 13.60
Vested (in shares) | shares 146,391
Vested (in dollars per share) | $ / shares $ 11.16
Forfeited (in shares) | shares 4,171
Forfeited (in dollars per share) | $ / shares $ 13.35
Canceled or expired (in shares) | shares
Canceled or expired (in dollars per share) | $ / shares
Outstanding, July 2, 2016 (in shares) | shares 326,538
Outstanding, July 2, 2016 (in dollars per share) | $ / shares $ 13.30
Performance Shares [Member]  
Outstanding, January 2, 2016 (in shares) | shares 84,062
Outstanding, January 2, 2016 (in dollars per share) | $ / shares $ 20.70
Granted (in shares) | shares 175,945
Granted (in dollars per share) | $ / shares $ 13.69
Vested (in shares) | shares 7,039
Vested (in dollars per share) | $ / shares $ 20.56
Forfeited (in shares) | shares
Forfeited (in dollars per share) | $ / shares
Canceled or expired (in shares) | shares 12,493
Canceled or expired (in dollars per share) | $ / shares $ 20.56
Outstanding, July 2, 2016 (in shares) | shares 240,475
Outstanding, July 2, 2016 (in dollars per share) | $ / shares $ 15.58