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Note 5 - Marketable Securities - Available-for-sale Marketable Securities (Details) - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019
Available-for-sale - matures within one year, Amortized cost	$ 12,486	$ 18,224
Available-for-sale - matures within one year, Gross unrealized gains	72	16
Available-for-sale - matures within one year, Gross unrealized losses	0	(11)
Available-for-sale - matures within one year, Fair value	12,558	18,229
Available-for-sale - matures after one year through five years, Amortized cost	65,606	46,593
Available-for-sale - matures after one year through five years, Gross unrealized gains	610	168
Available-for-sale - matures after one year through five years, Gross unrealized losses	(268)	(123)
Available-for-sale - matures after one year through five years, Fair value	65,948	46,638
Available-for-sale, Amortized cost	78,092	64,817
Available-for-sale, Gross unrealized gains	682	184
Available-for-sale, Gross unrealized losses	(268)	(134)
Marketable securities	78,506	64,867
Corporate Bonds [Member]
Available-for-sale - matures within one year, Amortized cost	12,486	18,224
Available-for-sale - matures within one year, Gross unrealized gains	72	16
Available-for-sale - matures within one year, Gross unrealized losses	0	(11)
Available-for-sale - matures within one year, Fair value	12,558	18,229
Available-for-sale - matures after one year through five years, Amortized cost	65,606	46,593
Available-for-sale - matures after one year through five years, Gross unrealized gains	610	168
Available-for-sale - matures after one year through five years, Gross unrealized losses	(268)	(123)
Available-for-sale - matures after one year through five years, Fair value	$ 65,948	$ 46,638

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Amount, before tax, of unrealized gain in accumulated other comprehensive income (AOCI) on 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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