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Note 4 - Cash and Cash Equivalents and Short-term Investments (Details) - Short-term Investments (USD $)					12 Months Ended			12 Months Ended				12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2012 Mutual Funds [Member] Estimate of Fair Value Measurement [Member]	Dec. 31, 2012 Mutual Funds [Member] Fair Value, Inputs, Level 1 [Member]	Dec. 31, 2012 Mutual Funds [Member]	Dec. 31, 2012 Municipal Bond Securities [Member] Estimate of Fair Value Measurement [Member]	Dec. 31, 2012 Municipal Bond Securities [Member] Fair Value, Inputs, Level 2 [Member]	Dec. 31, 2012 Municipal Bond Securities [Member]	Dec. 31, 2012 Total Available For Sale Securities [Member] Estimate of Fair Value Measurement [Member]	Dec. 31, 2012 Total Available For Sale Securities [Member] Fair Value, Inputs, Level 1 [Member]	Dec. 31, 2012 Total Available For Sale Securities [Member] Fair Value, Inputs, Level 2 [Member]	Dec. 31, 2012 Total Available For Sale Securities [Member]
Note 4 - Cash and Cash Equivalents and Short-term Investments (Details) - Short-term Investments [Line Items]
Total Fair Value	$ 0	$ 49,211,000	$ 27,582,000	$ 27,582,000		$ 21,629,000	$ 21,629,000		$ 49,211,000	$ 27,582,000	$ 21,629,000
Gross Unrealized Gains (pre-tax)					337,000			862,000				1,199,000
Gross Unrealized Losses (pre-tax)					$ 9,000			$ 128,000				$ 137,000

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- Definition

Amount of unrealized gain before deducting unrealized loss on investments in debt and equity securities classified as available-for-sale securities.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 320

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27161-111563

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- Definition

Amount of unrealized loss before deducting unrealized gain on investments in available-for-sale securities.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 320

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (c)

-URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27161-111563

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Investments which are intended to be sold in the short term (usually less than one year or the normal operating cycle, whichever is longer) including trading securities, available-for-sale securities, held-to-maturity securities, and other short-term investments not otherwise listed in the existing taxonomy.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.2)

-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 03

-Paragraph 1

-Subparagraph g

-Article 7

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