Note 5 - Marketable Securities - Available-for-sale Marketable Securities (Details) - USD ($) $ in Thousands	Jun. 30, 2020	Dec. 31, 2019
Available-for-sale - matures within one year, Amortized cost	$ 16,772	$ 18,224
Available-for-sale - matures within one year, Gross unrealized gains	62	16
Available-for-sale - matures within one year, Gross unrealized losses	(27)	(11)
Available-for-sale - matures within one year, Fair value	16,807	18,229
Available-for-sale - matures after one year through five years, Amortized cost	50,272	46,593
Available-for-sale - matures after one year through five years, Gross unrealized gains	547	168
Available-for-sale - matures after one year through five years, Gross unrealized losses	(333)	(123)
Available-for-sale - matures after one year through five years, Fair value	50,486	46,638
Available-for-sale, Amortized cost	67,044	64,817
Available-for-sale, Gross unrealized gains	609	184
Available-for-sale, Gross unrealized losses	(360)	(134)
Marketable securities	67,293	64,867
Corporate Bonds [Member]
Available-for-sale - matures within one year, Amortized cost	16,772	18,224
Available-for-sale - matures within one year, Gross unrealized gains	62	16
Available-for-sale - matures within one year, Gross unrealized losses	(27)	(11)
Available-for-sale - matures within one year, Fair value	16,807	18,229
Available-for-sale - matures after one year through five years, Amortized cost	50,272	46,593
Available-for-sale - matures after one year through five years, Gross unrealized gains	547	168
Available-for-sale - matures after one year through five years, Gross unrealized losses	(333)	(123)
Available-for-sale - matures after one year through five years, Fair value	$ 50,486	$ 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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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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