Total cash and cash equivalents and marketable investments at fair market value.

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Total cash, cash equivalents and marketable investments at amortized cost.

+ References

No definition available.

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Amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading.

+ References

No definition available.

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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

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Amount before tax of unrealized loss in accumulated other comprehensive income (AOCI) on investments in debt and equity securities classified as available-for-sale.

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No definition available.

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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.

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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. Also includes 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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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 4
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-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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Fair value portion 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. Also includes 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.

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Note 3 - Cash, Cash Equivalent and Marketable Investments - Unrealized Gains and Losses Related to Marketable Investments (Details) - USD ($)	Jun. 30, 2018	Dec. 31, 2017	Jun. 30, 2017	Dec. 31, 2016
Cash and cash equivalents, Amortized Cost	$ 18,432,000	$ 14,184,000	$ 18,679,000	$ 13,775,000
Cash and cash equivalents, Fair Market Value	18,432,000	14,184,000
Marketable investments, Amortized Cost	10,600,000	21,760,000
Marketable investments, Gross Unrealized Gains		2,000
Marketable investments, Gross Unrealized Losses	(27,000)	(34,000)
Marketable investments, Fair Market Value	10,573,000	21,728,000
Marketable investments, Amortized Cost	29,032,000	35,944,000
Marketable investments, Fair Market Value	29,005,000	35,912,000
US Treasury and Government [Member]
Marketable investments, Amortized Cost	6,012,000	11,885,000
Marketable investments, Gross Unrealized Gains
Marketable investments, Gross Unrealized Losses	(8,000)	(15,000)
Marketable investments, Fair Market Value	6,004,000	11,870,000
US States and Political Subdivisions Debt Securities [Member]
Marketable investments, Amortized Cost	200,000	201,000
Marketable investments, Gross Unrealized Gains
Marketable investments, Gross Unrealized Losses	(1,000)	(1,000)
Marketable investments, Fair Market Value	199,000	200,000
Commercial Paper, Not Included with Cash and Cash Equivalents [Member]
Marketable investments, Amortized Cost		1,836,000
Marketable investments, Gross Unrealized Gains
Marketable investments, Gross Unrealized Losses		(3,000)
Marketable investments, Fair Market Value		1,833,000
Corporate Debt Securities [Member]
Marketable investments, Amortized Cost	4,388,000	7,838,000
Marketable investments, Gross Unrealized Gains		2,000
Marketable investments, Gross Unrealized Losses	(18,000)	(15,000)
Marketable investments, Fair Market Value	4,370,000	7,825,000
Cash [Member]
Cash and cash equivalents, Amortized Cost	15,545,000	14,058,000
Cash and cash equivalents, Fair Market Value	15,545,000	14,058,000
Money Market Funds [Member]
Cash and cash equivalents, Amortized Cost	2,887,000	126,000
Cash and cash equivalents, Fair Market Value	$ 2,887,000	$ 126,000