Cash, Cash Equivalents, and Marketable Securities [Text Block] | Note 2. Cash , Cash Equivalents and Marketable Investments The Company invests its cash primarily in money market funds, commercial paper, corporate notes and bonds, municipal bonds, and debt securities issued by the U.S. government and its agencies. The Company considers all highly liquid investments, with an original maturity of three months or less at the time of purchase, to be cash equivalents. Investments with maturities of greater than three months at the time of purchase are accounted for as “available-for-sale ,” are carried at fair value with unrealized gains and losses reported as a component of stockholders’ equity, are held for use in current operations and are classified in current assets as “marketable investments .” The following tables summarize the components, and the unrealized gains and losses position, related to the Company’s cash, cash equivalents and marketable investments (in thousands): September 30, 2015 Amortized Cost Gross Unrealized Gains Gross Unrealized Losses Fair Market Value Cash and cash equivalents: Cash $ 7,137 $ — $ — $ 7,137 Money market funds 719 — — 719 Commercial paper 2,199 — — 2,199 Total cash and cash equivalents 10,055 — — 10,055 Marketable investments: U.S. government notes 7,766 23 — 7,789 U.S. government agencies 9,676 18 — 9,694 Municipal securities 3,913 8 — 3,921 Commercial paper 4,996 2 — 4,998 Corporate debt securities 11,288 3 (4 ) 11,287 Total marketable investments 37,639 54 (4 ) 37,689 Total cash, cash equivalents and marketable investments $ 47,694 $ 54 $ (4 ) $ 47,744 December 31, 2014 Amortized Cost Gross Unrealized Gains Gross Unrealized Losses Fair Market Value Cash and cash equivalents: Cash $ 7,761 $ — $ — $ 7,761 Money market funds 242 — — 242 Commercial paper 1,800 — — 1,800 Total cash and cash equivalents 9,803 — — 9,803 Marketable investments: U.S. government notes 18,345 17 (1 ) 18,361 U.S. government agencies 19,768 33 (1 ) 19,800 Municipal securities 3,607 3 (3 ) 3,607 Commercial paper 10,693 2 — 10,695 Corporate debt securities 18,875 13 (8 ) 18,880 Total marketable investments 71,288 68 (13 ) 71,343 Total cash, cash equivalents and marketable investments $ 81,091 $ 68 $ (13 ) $ 81,146 As of September 30, 2015 and December 31, 2014, total gross unrealized losses were $4 ,000 and $13,000, respectively, and were related to interest rate changes on available-for-sale marketable investments. The Company has concluded that it is more-likely-than-not that the securities will be held until maturity or the recovery of their cost basis. No securities were in an unrealized loss position for more than 12 months . The following table summarizes the contractual maturities of the Company’s available-for-sale securities, classified as marketable investments as of September 30, 2015 (in thousands): Amount Due in less than one year $ 26,103 Due in 1 to 3 years 11,586 Total marketable investments $ 37,689 |