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Note 4 - Marketable Securities - Available-for-sale Marketable Securities in Gross Unrealized Loss Position (Details) $ in Thousands	Mar. 31, 2019 USD ($)
Estimated fair value, less than 12 months	$ 104
Gross unrealized holding losses, less than 12 months	(1)
Estimated fair value, more than 12 months	9,019
Gross unrealized holding losses, more than 12 months	(18)
Estimated fair value	9,123
Gross unrealized holding losses	(19)
Corporate Debt Securities [Member]
Estimated fair value, less than 12 months	104
Gross unrealized holding losses, less than 12 months	(1)
Estimated fair value, more than 12 months	5,386
Gross unrealized holding losses, more than 12 months	(11)
Estimated fair value	5,490
Gross unrealized holding losses	(12)
US States and Political Subdivisions Debt Securities [Member]
Estimated fair value, less than 12 months
Gross unrealized holding losses, less than 12 months
Estimated fair value, more than 12 months	3,633
Gross unrealized holding losses, more than 12 months	(7)
Estimated fair value	3,633
Gross unrealized holding losses	$ (7)

X

- Definition

Amount of accumulated unrealized loss on investments in debt and equity securities classified as available-for-sale that have been in a continuous loss position for twelve months or longer.

+ References

No definition available.

+ Details

Name:	us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPosition12MonthsOrLongerAccumulatedLoss
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

Amount of accumulated unrealized loss on investments in debt and equity securities classified as available-for-sale in a continuous loss position.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 7
-URI http://asc.fasb.org/extlink&oid=118939692&loc=d3e27337-111563

+ Details

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Namespace Prefix:	us-gaap_
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Balance Type:	debit
Period Type:	instant

X

- Definition

This item represents the aggregate fair value of investments in debt and equity securities in an unrealized loss position which are categorized neither as held-to-maturity nor trading securities.

+ References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
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X

- Definition

Amount of accumulated unrealized loss on investments in debt and equity securities classified as available-for-sale that have been in a continuous loss position for less than twelve months.

+ References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

This item represents the aggregate fair value of investments in debt and equity securities categorized neither as held-to-maturity nor trading securities that have been in a continuous unrealized loss position for less than twelve months.

+ References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
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X

- Definition

This item represents the aggregate fair value of investments in debt and equity securities categorized neither as held-to-maturity nor trading securities that have been in a continuous unrealized loss position for twelve months or longer.

+ References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
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X

- Details

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Namespace Prefix:
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X

- Details

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Period Type: