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Note 10 - Per Share Data - Unissued Shares of Common Stock Were Reserved For The Following Purposes (Details) - shares
Oct. 01, 2016
Jan. 02, 2016
Time-based Restricted Stock Units [Member]    
Restricted stock units outstanding (in shares) 233,834 208,834
Performance-based Restricted Stock Units [Member]    
Restricted stock units outstanding (in shares) 200,000 0
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number 44,500 44,500
Future grants of options or shares (in shares) 157,000 382,000
Shares reserved for employee stock purchase plan (in shares) 268,211 349,436
Common Stock, Capital Shares Reserved for Future Issuance 903,545 984,770