Note 9 - Stockholders' Equity (Tables)

6 Months Ended

Jun. 30, 2018

Notes Tables

Share-based Compensation, Activity [Table Text Block]

	Number of Shares			Weighted Average Exercise Price
Outstanding at December 31, 2017		7,024,275		$	0.29
Granted		--			--
Exercised		--			--
Forfeited or expired		(138,000	)		3.01
Outstanding at June 30, 2018		6,886,275		$	0.24
Exercisable at June 30, 2018		1,890,618		$	0.71