Note 11 - Stock Option Activity (Details) - USD ($) $ in Thousands		12 Months Ended
	Jan. 01, 2013	Dec. 31, 2015	Dec. 31, 2014
Covered Shares (in shares)		3,095,327	3,550,599
Weighted- Average Exercise Price (in dollars per share)		$ 1.07	$ 0.99
Weighted- Average Remaining Contractual Term	6 years 233 days	5 years 62 days	6 years 142 days
Aggregate Intrinsic Value		$ 1,322	$ 3,577
Exercised/cancelled, covered shares (in shares)		(61,124)	(453,522)
Exercised/cancelled, weighted-average exercise price (in dollars per share)		$ 0.69	$ 0.53
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period, Intrinsic Value		$ 46	$ 445
Forfeited or expired, covered shares (in shares)		(67,709)	(1,750)
Forfeited or expired, weighted-average exercise price (in dollars per share)		$ 1.62	$ 1.01
Covered Shares (in shares)		2,966,494	3,095,327
Weighted- Average Exercise Price (in dollars per share)		$ 1.05	$ 1.07
Aggregate Intrinsic Value		$ 753	$ 1,322
Exercise of stock options (in shares)		61,124	453,522
Forfeited or expired, covered shares (in shares)		67,709	1,750
Exercisable at December 31, 2015 (in shares)		2,543,941
Exercisable at December 31, 2015 (in dollars per share)		$ 0.91
Exercisable at December 31, 2015		4 years 277 days
Exercisable at December 31, 2015		$ 753