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

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Total amortized costs for cash, cash equivalents, and marketable securities.

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

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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 - Investment Securities (Details) - Unrealized Gains and Losses Related to Marketable Investments and Long-term Investments (USD $) In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Note 2 - Investment Securities (Details) - Unrealized Gains and Losses Related to Marketable Investments and Long-term Investments [Line Items]
Amortized Cost	$ 9,803	$ 16,242	$ 23,546	$ 14,020
Marketable investments
Gross Unrealized Gains	68	114
Gross Unrealized Losses	(13)	(13)
Fair Market Value	71,343us-gaap_AvailableForSaleSecurities	66,831us-gaap_AvailableForSaleSecurities
Amortized Cost	81,091	82,972
Gross Unrealized Gains	68	114
Fair Market Value	81,146	83,073
Cash and Cash Equivalents [Member]
Note 2 - Investment Securities (Details) - Unrealized Gains and Losses Related to Marketable Investments and Long-term Investments [Line Items]
Amortized Cost	9,803	16,242
Fair Market Value	9,803	16,242
MarketableInvestmentsMember
Marketable investments
Amortized Cost	71,288	66,730
Gross Unrealized Gains	68	114
Gross Unrealized Losses	(13)	(13)
Fair Market Value	71,343	66,831
Gross Unrealized Gains	68	114
US Treasury and Government [Member]
Marketable investments
Amortized Cost	18,345	10,516
Gross Unrealized Gains	17	11
Gross Unrealized Losses	(1)	(5)
Fair Market Value	18,361	10,522
Gross Unrealized Gains	17	11
US Government Agencies Debt Securities [Member]
Marketable investments
Amortized Cost	19,768	25,823
Gross Unrealized Gains	33	38
Gross Unrealized Losses	(1)	(3)
Fair Market Value	19,800	25,858
Gross Unrealized Gains	33	38
US States and Political Subdivisions Debt Securities [Member]
Marketable investments
Amortized Cost	3,607	2,043
Gross Unrealized Gains	3	1
Gross Unrealized Losses	(3)	(5)
Fair Market Value	3,607	2,039
Gross Unrealized Gains	3	1
Commercial Paper, Not Included with Cash and Cash Equivalents [Member]
Marketable investments
Amortized Cost	10,693	10,239
Gross Unrealized Gains	2	3
Fair Market Value	10,695	10,242
Gross Unrealized Gains	2	3
Corporate Debt Securities [Member]
Marketable investments
Amortized Cost	18,875	18,109
Gross Unrealized Gains	13	61
Gross Unrealized Losses	(8)
Fair Market Value	18,880	18,170
Gross Unrealized Gains	$ 13	$ 61