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Note 6 - Financial Instruments and Fair Value (Details Textual) - USD ($)	3 Months Ended	12 Months Ended
	Jun. 30, 2015	Dec. 31, 2014	Dec. 31, 2011	Sep. 30, 2015
Auction Rate Securities [Member]
Available-for-sale Securities		$ 6,905,000		$ 6,650,000
Available-for-sale Securities, Amortized Cost Basis		7,425,000		$ 7,150,000
Available-for-sale Securities, Sold at Par	$ 275,000
Derivative, Basis Spread on Variable Rate				2.25%
Asset Impairment Charges			$ 1,000,000
Available-for-sale Debt Securities Gross Unrealized Gain		$ 427,000

X

- Definition

Amount of write-down of assets recognized in the income statement. Includes, but is not limited to, losses from tangible assets, intangible assets and goodwill.

+ References

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-SubTopic 10



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X

- Definition

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

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-Publisher FASB



-Name Accounting Standards Codification



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- Definition

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

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- Definition

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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- Definition

The aggregate value of securities held, which were categorized neither as trading nor held-to-maturity, for which the interest rate reset through an auction process, that failed to be liquidated through auction, and which were sold at par value during the period.

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- Definition

The percentage points added to the reference rate to compute the variable rate on the interest rate derivative.

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