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Note 5 - Short-term Investments
 12 Months Ended
Dec. 31, 2015
Notes to Financial Statements  
Investments in Debt and Marketable Equity Securities (and Certain Trading Assets) Disclosure [Text Block]
5.  Short-Term Investments
 
The Company held no short-term investments as of December 31, 2015. As of December 28, 2014, short-term investments consisted of commercial paper, corporate bonds and certificates of deposit which were classified as available-for-sale securities and carried at current fair market value, with the resulting unrealized losses excluded from earnings and reported, net of tax, as a separate component of shareholders' equity until realized. Unrealized losses were less than $0.1 million as of December 28, 2014. If the carrying value of an investment is in excess of its fair market value, an impairment charge to adjust the carrying value to the fair market value is recorded if the impairment is considered other-than-temporary. There were no other-than-temporary impairments related to declines in fair market value of short-term investments during the year ended December 28, 2014. All short-term investments held as of December 28, 2014 had original maturity dates of twelve months or less and were classified as current assets. Short-term investments as of December 28, 2014 consisted of the following:
 
 
 
Amortized
 
 
Fair
 
 
Unrealized
 
 
 
Cost
 
 
Value
 
 
Gain/(Loss)
 
 
(In thousands)
Commercial paper
   $ 23,982     $ 23,984     $ 2  
Corporate bonds
     21,717       21,693       (24 )
Certificates of deposit
     961       961       –  
Balances as of December 28, 2014
   $ 46,660     $ 46,638     $ (22 )