Annual report pursuant to Section 13 and 15(d)

Note 12 - Shareholders' Equity - Dividends Declared (Details)

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Note 12 - Shareholders' Equity - Dividends Declared (Details) - USD ($)
$ / shares in Units, $ in Thousands
12 Months Ended
Dec. 25, 2016
Dec. 27, 2015
Dec. 28, 2014
Dividend Declared 1 [Member]      
Dividend Per Share (in dollars per share) $ 0.07 $ 0.06 $ 0.05
Record Date Feb. 25, 2016 Feb. 26, 2015 Mar. 13, 2014
Total Amount $ 2,350 $ 2,082 $ 1,798
Payment Date Mar. 10, 2016 Mar. 12, 2015 Mar. 27, 2014
Dividends Declared 2 [Member]      
Dividend Per Share (in dollars per share) $ 0.07 $ 0.06 $ 0.05
Record Date May 12, 2016 May 14, 2015 May 15, 2014
Total Amount $ 2,338 $ 2,090 $ 1,798
Payment Date May 26, 2016 May 28, 2015 May 29, 2014
Dividends Declared 3 [Member]      
Dividend Per Share (in dollars per share) $ 0.07 $ 0.06 $ 0.05
Record Date Aug. 11, 2016 Aug. 13, 2015 Aug. 14, 2014
Total Amount $ 2,282 $ 2,108 $ 1,778
Payment Date Aug. 25, 2016 Aug. 27, 2015 Aug. 28, 2014
Dividends Declared 4 [Member]      
Dividend Per Share (in dollars per share) $ 0.07 $ 0.06 $ 0.05
Record Date Nov. 10, 2016 Nov. 19, 2015 Nov. 20, 2014
Total Amount $ 2,226 $ 2,069 $ 1,764
Payment Date Nov. 23, 2016 Dec. 03, 2015 Dec. 04, 2014