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Note 1 - Significant Accounting Policies - Scheduled Maturity for the Company's Investments (Details) - USD ($) $ in Thousands | Mar. 31, 2017 | Dec. 31, 2016
--- | --- | ---
Maturing in one year or less | $ 23,524 | $ 32,546
Maturing after one year through two years | 3,803 | 8,926
Total investments | $ 27,327 | $ 41,472

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