Note 5 - Stock-based Compensation (Details) - Stock options outstanding (USD $)	6 Months Ended
	Jun. 30, 2013
Stock options outstanding [Abstract]
Outstanding at December 30, 2012	393,500
Outstanding at December 30, 2012 (in Dollars per share)	$ 9.12
Granted	0
Granted (in Dollars per share)	$ 0
Exercised	94,000
Exercised (in Dollars per share)	$ 9.44
Forfeited or canceled	8,500
Forfeited or canceled (in Dollars per share)	$ 2.71
Outstanding at June 30, 2013	291,000
Outstanding at June 30, 2013 (in Dollars per share)	$ 8.39
Exercisable at June 30, 2013	286,000
Exercisable at June 30, 2013 (in Dollars per share)	$ 8.54