Note 2 - Investment Securities - Cash, Cash Equivalents and Marketable Securities (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Cash	$ 20,005	$ 21,969
Cash equivalents	26,316	26,052
Marketable securities	7,605	9,523
Total cash, cash equivalents and marketable securities	33,921	35,575
US Treasury and Government [Member]
Marketable securities	4,114	1,397
US Government Agencies Debt Securities [Member]
Marketable securities		2,677
US States and Political Subdivisions Debt Securities [Member]
Marketable securities		200
Corporate Debt Securities [Member]
Marketable securities		2,816
Money Market Funds [Member]
Cash equivalents	6,311	4,083
Commercial Paper [Member]
Cash equivalents	$ 3,491	$ 2,433

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

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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.

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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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Amount of investment in marketable security, classified as current.

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