Note 3 - Investments (Tables)

12 Months Ended

Dec. 31, 2016

Notes Tables

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

	December 31,
	2016			2015
Cost basis	$	543,000		$	502,000
Gain previously recognized on warrants		380,000			380,000
Loss included in accumulated other comprehensive loss		(316,000	)		(226,000	)
Fair value	$	607,000		$	656,000