Note 2 - Investment Securities - Cash, Cash Equivalents and Marketable Securities (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Cash	$ 21,969	$ 14,058
Cash equivalents	26,052	14,184
Marketable securities	9,523	21,728
Total cash, cash equivalents and marketable securities	35,575	35,912
US Treasury and Government [Member]
Marketable securities	1,397	11,870
US Government Agencies Debt Securities [Member]
Marketable securities	2,677
US States and Political Subdivisions Debt Securities [Member]
Marketable securities	200	200
Corporate Debt Securities [Member]
Marketable securities	2,816	7,825
Money Market Funds [Member]
Cash equivalents	4,083	126
Commercial Paper [Member]
Cash equivalents	$ 2,433	$ 1,833

Refers to the sum of cash equivalents and marketable securities as of balance sheet date.

No definition available.

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Amount of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Excludes cash and cash equivalents within disposal group and discontinued operation.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.1)
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Amount of short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. Excludes cash and cash equivalents within disposal group and discontinued operation.

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- Definition

Amount of investment in marketable security, classified as current.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section 45
-Paragraph 1
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-URI http://asc.fasb.org/extlink&oid=82887183&loc=d3e6676-107765

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-Name Accounting Standards Codification
-Topic 210
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-Section S99
-Paragraph 1
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-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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