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Note 1 - Significant Accounting Policies and Concentration of Risk - Scheduled Maturity for the Company's Investments (Details) - USD ($) $ in Thousands | Dec. 31, 2016 | Dec. 31, 2015
--- | --- | ---
Maturing in one year or less | $ 32,546 | $ 22,664
Maturing after one year through two years | 8,926 | 28,395
Maturing after two years |  | 19,288
Total investments | $ 41,472 | $ 70,347

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