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Note 1 - Significant Accounting Policies and Concentrations of Risk - Scheduled Maturity for the Company's Investments (Details) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Maturing in one year or less	$ 47,540	$ 64,115
Maturing after one year through two years	38,505	34,257
Maturing after two years	3,094	7,038
Total investments	$ 89,139	$ 105,410

X

- Definition

Represents available for sale securities debt maturities after one through two years fair value.

+ References

No definition available.

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- Definition

Represents debt maturities after two years.

+ References

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- Definition

Fair value of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), maturing in next fiscal year following latest fiscal year. Excludes interim and annual periods when interim period is reported on rolling approach, from latest statement of financial position date.

+ References

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Amount of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

+ References

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