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Note 3 - Investments (Tables)

12 Months Ended

Dec. 31, 2015

Schedule of Available-for-sale Securities Reconciliation [Table Text Block]

	December 31,
	2015			2014
Cost basis	$	502,000		$	327,000
Gain previously recognized on warrants		380,000			380,000
Gain (loss) included in accumulated other comprehensive income (loss)		(226,000	)		2,133,000
Fair value	$	656,000		$	2,840,000

Schedule of Stockholders' Equity Note, Warrants or Rights [Table Text Block]

	December 31,
	2015		2014
Beginning balance	$	-	$	350,000
Fair value change in common stock warrants (1)		-		30,000
Fair value of warrants exercised		-		(380,000	)
Ending balance	$	-	$	-

- Definition

Tabular disclosure of warrants or rights issued. Warrants and rights outstanding are derivative securities that give the holder the right to purchase securities (usually equity) from the issuer at a specific price within a certain time frame. Warrants are often included in a new debt issue to entice investors by a higher return potential. The main difference between warrants and call options is that warrants are issued and guaranteed by the company, whereas options are exchange instruments and are not issued by the company. Also, the lifetime of a warrant is often measured in years, while the lifetime of a typical option is measured in months. Disclose the title of issue of securities called for by warrants and rights outstanding, the aggregate amount of securities called for by warrants and rights outstanding, the date from which the warrants or rights are exercisable, and the price at which the warrant or right is exercisable.

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