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Note 4 - Effective Maturities of Short-term Investments (Details) - USD ($)
$ in Thousands
Mar. 26, 2016
Dec. 26, 2015
Due in one year or less, amortized cost $ 9,575 $ 1,450
Due in one year or less, estimated fair value $ 9,576 1,450
Due after one year through three years, amortized cost 202
Due after one year through three years, estimated fair value 202
$ 9,575 1,652
$ 9,576 $ 1,652