Note 4 - Investments (Tables)

6 Months Ended

Jun. 30, 2016

Notes Tables

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

	June 30,			December 31,
	2016			2015
Cost basis	$	543,000		$	502,000
Gains previously recognized on warrants		380,000			380,000
Loss included in accumulated other comprehensive income (loss)		(349,000	)		(226,000	)
Fair value	$	574,000		$	656,000