Note 11 - Stock Option Activity (Details)	9 Months Ended
	Oct. 03, 2015 $ / shares shares
Options outstanding as of January 3, 2015, shares (in shares) | shares	53,000
Options outstanding as of January 3, 2015, weighted average exercise price (in dollars per share)	$ 7.65
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross | shares	0
Options exercised, shares (in shares) | shares	(3,500)
Options exercised, weighted average exercise price (in dollars per share)	$ 4.30
Options forfeited/cancelled, shares (in shares) | shares	(5,000)
Options forfeited/cancelled, weighted average exercise price (in dollars per share)	$ 5.78
Options outstanding as of October 3, 2015, shares (in shares) | shares	44,500
Options outstanding as of October 3, 2015, weighted average exercise price (in dollars per share)	$ 8.12
Options outstanding price range at October 3, 2015 (in dollars per share)	5.27
Options outstanding price range at October 3, 2015 (in dollars per share)	$ 9.81
Options exercisable, shares (in shares) | shares	27,000
Options exercisable, weighted average exercise price (in dollars per share)	$ 9.47
Intrinsic value per share of outstanding stock options as of October 3, 2015 (in dollars per share)	0
Intrinsic value per share of stock options exercised for the thirty-nine week period ended October 3, 2015 (in dollars per share)	$ 2