Note 4 - Investments (Tables)

3 Months Ended

Mar. 31, 2016

Notes Tables

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

	March 31,			December 31,
	2016			2015
Cost basis	$	544,000		$	502,000
Gains previously recognized on warrants		380,000			380,000
Loss included in accumulated other comprehensive income (loss)		(373,000	)		(226,000	)
Fair value	$	551,000		$	656,000