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Note 10 - Stockholders' Equity - Summary of Stock Options Activity by Range of Exercise Prices (Details)
 12 Months Ended
Jan. 01, 2017
$ / shares
shares
Options Outstanding Number Outstanding (in shares) | shares 87,500
Options Outstanding Weighted Average Remaining Contractual Life (Year) 2 years 328 days
Options Outstanding Weighted Average Exercise Price (in dollars per share) $ 8.75
Options Exercisable Number Exercisable (in shares) | shares 87,500
Options Exercisable Weighted Average Exercise Price (in dollars per share) $ 8.75
Exercise Price Range One [Member]  
Range of Exercise Prices, Lower (in dollars per share) 4.01
Range of Exercise Prices, Upper (in dollars per share) $ 5
Options Outstanding Number Outstanding (in shares) | shares 40,000
Options Outstanding Weighted Average Remaining Contractual Life (Year) 2 years
Options Outstanding Weighted Average Exercise Price (in dollars per share) $ 4.31
Options Exercisable Number Exercisable (in shares) | shares 40,000
Options Exercisable Weighted Average Exercise Price (in dollars per share) $ 4.31
Exercise Price Range Two [Member]  
Range of Exercise Prices, Lower (in dollars per share) 12
Range of Exercise Prices, Upper (in dollars per share) $ 14
Options Outstanding Number Outstanding (in shares) | shares 47,500
Options Outstanding Weighted Average Remaining Contractual Life (Year) 3 years 255 days
Options Outstanding Weighted Average Exercise Price (in dollars per share) $ 12.49
Options Exercisable Number Exercisable (in shares) | shares 47,500
Options Exercisable Weighted Average Exercise Price (in dollars per share) $ 12.49