Note 5 - Marketable Securities - Available-for-sale Marketable Securities (Details) - USD ($) $ in Thousands	Mar. 31, 2020	Dec. 31, 2019
Available-for-sale - matures within one year, Amortized cost	$ 17,049	$ 18,224
Available-for-sale - matures within one year, Gross unrealized gains	35	16
Available-for-sale - matures within one year, Gross unrealized losses	(155)	(11)
Available-for-sale - matures within one year, Fair value	16,929	18,229
Available-for-sale - matures after one year through five years, Amortized cost	51,586	46,593
Available-for-sale - matures after one year through five years, Gross unrealized gains	195	168
Available-for-sale - matures after one year through five years, Gross unrealized losses	(801)	(123)
Available-for-sale - matures after one year through five years, Fair value	50,980	46,638
Available-for-sale, Amortized cost	68,635	64,817
Available-for-sale, Gross unrealized gains	230	184
Available-for-sale, Gross unrealized losses	(956)	(134)
Marketable securities	67,909	64,867
Corporate Bonds [Member]
Available-for-sale - matures within one year, Amortized cost	17,049	18,224
Available-for-sale - matures within one year, Gross unrealized gains	35	16
Available-for-sale - matures within one year, Gross unrealized losses	(155)	(11)
Available-for-sale - matures within one year, Fair value	16,929	18,229
Available-for-sale - matures after one year through five years, Amortized cost	51,586	46,593
Available-for-sale - matures after one year through five years, Gross unrealized gains	195	168
Available-for-sale - matures after one year through five years, Gross unrealized losses	(801)	(123)
Available-for-sale - matures after one year through five years, Fair value	$ 50,980	$ 46,638

Available for sale matures after one year through five years gross unrealized gains.

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Available for sale matures within one year, gross unrealized gains.

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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).

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Amount, before tax, of unrealized loss 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).

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

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Amortized cost 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 rolling fiscal year through fifth year following latest fiscal year. For interim and annual periods when interim period is reported on rolling approach, from latest statement of financial position date.

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