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

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

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

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 320

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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.

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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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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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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 2 - Cash, Cash Equivalents and Marketable Investments (Details) - Unrealized Gains and Losses Related to Marketable Investments (USD $)	Mar. 31, 2015	Dec. 31, 2014	Mar. 31, 2014	Dec. 31, 2013
Cash and cash equivalents:
Amortized Cost	$ 13,462,000	$ 9,803,000	$ 10,743,000	$ 16,242,000
Fair Market Value	13,462,000	9,803,000
Marketable investments:
Amortized Cost	62,508,000	71,288,000
Gross Unrealized Gains	95,000	68,000
Gross Unrealized Losses	(8,000)	(13,000)
Fair Market Value	62,595,000us-gaap_AvailableForSaleSecurities	71,343,000us-gaap_AvailableForSaleSecurities
Amortized Cost	75,970,000	81,091,000
Gross Unrealized Gains	95,000	68,000
Gross Unrealized Losses	(8,000)	(13,000)
Fair Market Value	76,057,000	81,146,000
US Treasury and Government [Member]
Marketable investments:
Amortized Cost	14,320,000	18,345,000
Gross Unrealized Gains	35,000	17,000
Gross Unrealized Losses		(1,000)
Fair Market Value	14,355,000	18,361,000
Gross Unrealized Gains	35,000	17,000
Gross Unrealized Losses		(1,000)
US Government Agencies Debt Securities [Member]
Marketable investments:
Amortized Cost	18,259,000	19,768,000
Gross Unrealized Gains	34,000	33,000
Gross Unrealized Losses	(3,000)	(1,000)
Fair Market Value	18,290,000	19,800,000
Gross Unrealized Gains	34,000	33,000
Gross Unrealized Losses	(3,000)	(1,000)
US States and Political Subdivisions Debt Securities [Member]
Marketable investments:
Amortized Cost	3,914,000	3,607,000
Gross Unrealized Gains	3,000	3,000
Gross Unrealized Losses	(3,000)	(3,000)
Fair Market Value	3,914,000	3,607,000
Gross Unrealized Gains	3,000	3,000
Gross Unrealized Losses	(3,000)	(3,000)
Commercial Paper, Not Included with Cash and Cash Equivalents [Member]
Marketable investments:
Amortized Cost	10,735,000	10,693,000
Gross Unrealized Gains	4,000	2,000
Fair Market Value	10,739,000	10,695,000
Gross Unrealized Gains	4,000	2,000
Corporate Debt Securities [Member]
Marketable investments:
Amortized Cost	15,280,000	18,875,000
Gross Unrealized Gains	19,000	13,000
Gross Unrealized Losses	(2,000)	(8,000)
Fair Market Value	15,297,000	18,880,000
Gross Unrealized Gains	19,000	13,000
Gross Unrealized Losses	(2,000)	(8,000)
Cash [Member]
Cash and cash equivalents:
Amortized Cost	6,553,000	7,761,000
Fair Market Value	6,553,000	7,761,000
Money Market Funds [Member]
Cash and cash equivalents:
Amortized Cost	3,759,000	242,000
Fair Market Value	3,759,000	242,000
Commercial Paper [Member]
Cash and cash equivalents:
Amortized Cost	3,150,000	1,800,000
Fair Market Value	$ 3,150,000	$ 1,800,000