Note 4 - Investments (Tables)

9 Months Ended

Sep. 30, 2016

Notes Tables

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

	September 30,				December 31
	2016				2015
Cost basis	$	543,000		$	502,000
Gains previously recognized on warrants		380,000			380,000
Gross loss included in accumulated other comprehensive income (loss)		(306,000	)		(226,000	)
Fair value	$	617,000		$	656,000