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Note 1 - Significant Accounting Policies - Scheduled Maturity for the Company's Investments (Details) - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019
Maturing in one year or less	$ 46,827	$ 22,054
Maturing after one year through two years	3,002	0
Total investments	$ 49,829	$ 22,054

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

Fair value of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), with single maturity date and allocated without single maturity date, maturing in next fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
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- Definition

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

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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