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Note 4 - Effective Maturities of Short-term Investments (Details) - USD ($)
$ in Thousands
Jun. 25, 2016
Dec. 26, 2015
Due in one year or less, amortized cost $ 9,215 $ 1,450
Due in one year or less, estimated fair value 9,215 1,450
Due after one year through three years, amortized cost 202
Due after one year through three years, estimated fair value 202
9,215 1,652
$ 9,215 $ 1,652