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Note 4 - Stock-based Compensation - Summary of Plans Related to Unvested Restricted Stock (Details)
6 Months Ended
Jul. 01, 2017
$ / shares
shares
Restricted Stock [Member]  
Outstanding (in dollars per share) | $ / shares $ 13.30
Outstanding (in shares) | shares 316,116
Canceled or expired (in dollars per share) | $ / shares
Granted (in shares) | shares 252,121
Granted (in dollars per share) | $ / shares $ 9.19
Vested (in shares) | shares 174,032
Vested (in dollars per share) | $ / shares $ 12.16
Forfeited (in shares) | shares 24,331
Forfeited (in dollars per share) | $ / shares $ 12.96
Canceled or expired (in shares) | shares
Outstanding (in dollars per share) | $ / shares $ 11.05
Outstanding (in shares) | shares 369,874
Performance Shares [Member]  
Outstanding (in dollars per share) | $ / shares $ 15.39
Outstanding (in shares) | shares 241,141
Canceled or expired (in dollars per share) | $ / shares $ 13.68
Granted (in shares) | shares 83,897
Granted (in dollars per share) | $ / shares $ 8.85
Vested (in shares) | shares 6,472
Vested (in dollars per share) | $ / shares $ 20.54
Forfeited (in shares) | shares 15,247
Forfeited (in dollars per share) | $ / shares $ 14.28
Canceled or expired (in shares) | shares 13,704
Outstanding (in dollars per share) | $ / shares $ 13.66
Outstanding (in shares) | shares 289,615