Note 4 - Investments (Tables)

6 Months Ended

Jun. 30, 2017

Notes Tables

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

	June 30,			December 31,
	2017			2016
Cost basis	$	543,000		$	543,000
Gains previously recognized on warrants		380,000			380,000
Loss included in accumulated other comprehensive loss before tax benefit		(359,000	)		(316,000	)
Fair value	$	564,000		$	607,000