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Note 11 - Information About Stock Options Outstanding (Details)
 12 Months Ended
Jan. 02, 2016
$ / shares
shares
Exercise Price Range 01 [Member]  
Range of Exercise Prices Lower Unit (in dollars per share) | $ / shares $ 5.27
Range of Exercise Prices Upper Unit (in dollars per share) | $ / shares $ 5.62
Number of Outstanding Options (in shares) 4,500
Number of Vested Options (in shares) 4,500
Weighted-Average Remaining Contractual Life, Outstanding 4 years 259 days
Weighted-Average Remaining Contractual Life Vested 4 years 259 days
Weighted-Average Exercise Price Outstanding (in dollars per share) | $ / shares $ 5.46
Weighted-Average Exercise Price Vested (in dollars per share) | $ / shares $ 5.46
Exercise Price Range 02 [Member]  
Number of Outstanding Options (in shares) 15,000
Number of Vested Options (in shares) 0
Weighted-Average Remaining Contractual Life, Outstanding 8 years 135 days
Weighted-Average Exercise Price Outstanding (in dollars per share) | $ / shares $ 6.10
Exercise Price Range 03 [Member]  
Number of Outstanding Options (in shares) 25,000
Number of Vested Options (in shares) 25,000
Weighted-Average Remaining Contractual Life, Outstanding 1 year 197 days
Weighted-Average Remaining Contractual Life Vested 1 year 197 days
Weighted-Average Exercise Price Outstanding (in dollars per share) | $ / shares $ 9.81
Weighted-Average Exercise Price Vested (in dollars per share) | $ / shares $ 9.81
Number of Outstanding Options (in shares) 44,500
Number of Vested Options (in shares) 29,500