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Note 2 - Marketable Securities - Available-for-sale Securities by Major Security Type (Details) - USD ($) $ in Thousands | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | ---
Amortized cost | $ 4,760 | $ 13,095
Gross unrealized holding gains | 1 | 20
Gross unrealized holding losses | (46) | (77)
Available-for-sale securities | 4,715 | 13,038
Corporate Debt Securities [Member] |  |
Amortized cost | 2,911 | 8,458
Gross unrealized holding gains | 1 | 19
Gross unrealized holding losses | (31) | (49)
Available-for-sale securities | 2,881 | 8,428
US States and Political Subdivisions Debt Securities [Member] |  |
Amortized cost | 1,849 | 4,637
Gross unrealized holding gains |  | 1
Gross unrealized holding losses | (15) | (28)
Available-for-sale securities | $ 1,834 | $ 4,610

X
- Definition Amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading. + 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 Amount before tax of unrealized gain in accumulated other comprehensive income (AOCI) on investments in debt and equity securities classified as available-for-sale. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27161-111563 + Details
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Balance Type: | credit
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X
- Definition Amount before tax of unrealized loss in accumulated other comprehensive income (AOCI) on investments in debt and equity securities classified as available-for-sale. + References No definition available. + Details
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X
- Definition This item represents the cost of debt and equity securities, which are categorized neither as held-to-maturity nor trading, net of adjustments including accretion, amortization, collection of cash, previous other-than-temporary impairments recognized in earnings (less any cumulative-effect adjustments recognized, as defined), and fair value hedge accounting adjustments, if any. + References No definition available. + Details
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X
- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancialInstrumentAxis=us-gaap_USStatesAndPoliticalSubdivisionsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |