Note 4 - Investments (Tables)

3 Months Ended

Mar. 31, 2018

Notes Tables

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

	March 31,			December 31,
	2018			2017
Cost basis	$	543,000		$	543,000
Gains previously recognized on warrants		380,000			380,000
Loss included in accumulated other comprehensive loss or reclassifed to retained earnings on Jaunuary 1, 2018		(580,000	)		(580,000	)
Unrealized gain recognized in earings since January 1, 2018		32,000			-
Fair value	$	375,000		$	343,000