Note 10 - Stock Option Activity (Details) - $ / shares	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 28, 2014	Sep. 30, 2015	Sep. 28, 2014
Balance (in shares)			755,617	798,171
Balance (in shares)			616,792	585,769
Balance (in shares)			276,635	263,424
Balance (in dollars per share)			$ 6.09	$ 5.97
Authorized (in shares)			2,250,000
Forfeited/cancelled/expired (in shares)			(6,000)	(25,211)
Forfeited/cancelled/expired (in shares)			6,000	24,211
Exercised (in shares)	(2,500)	(500)	(5,000)	(28,343)
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross			1,610,000	11,000
Granted (in shares)			(1,610,000)	(11,000)
Balance at September 30, 2015 (in shares)	2,354,617	755,617	2,354,617	755,617
Balance at September 30, 2015 (in shares)	744,617	615,792	744,617	615,792
Balance at September 30, 2015 (in shares)	922,635	276,635	922,635	276,635
Balance at September 30, 2015 (in dollars per share)	$ 8.10	$ 6.09	$ 8.10	$ 6.09
Forfeited/cancelled/expired (in shares)			(6,000)	(25,211)
Forfeited/cancelled/expired (in shares)			6,000	24,211
Forfeited/cancelled/expired (in dollars per share)				$ 5.19
Exercised (in dollars per share)				$ 4.73
Granted (in shares)			(1,610,000)	(11,000)
Granted (in dollars per share)				$ 9.18