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STOCKHOLDERS' EQUITY (Tables)
 12 Months Ended
Dec. 31, 2018
Stockholders' Equity Note [Abstract]  
Share-based Compensation, Stock Options, Activity [Table Text Block]
A summary of option activity under our stock option plans for the years ended December 31, 2018 and 2017 is as follows:
 
 
 
2018
 
 
2017
 
 
 
Number of

Options
 
 
Weighted

average

exercise

price
 
 
Number of

Options
 
 
Weighted

average

exercise

price
 
 
Weighted

average

remaining

contractual

term (years)
 
Options outstanding at the beginning of the year:
 
 
3,516,706
 
 
$
0.34
 
 
 
3,611,706
 
 
$
0.37
 
 
 
 
 
Granted
 
 
-
 
 
 
 
 
 
 
-
 
 
$
0.37
 
 
 
 
 
Exercised
 
 
-
 
 
 
 
 
 
 
-
 
 
 
 
 
 
 
 
 
Expired/Forfeited
 
 
(509,706
)
 
$
0.64
 
 
 
(95,000
)
 
$
1.49
 
 
 
 
 
Outstanding at end of year
 
 
3,007,000
 
 
$
0.29
 
 
 
3,516,706
 
 
$
0.34
 
 
 
4.46
 
Options exercisable at year-end
 
 
3,007,000
 
 
$
0.29
 
 
 
3,516,706
 
 
$
0.34
 
 
 
4.46
 
Options vested and expected to vest at year end
 
 
3,007,000
 
 
$
0.29
 
 
 
3,516,706
 
 
$
0.34
 
 
 
4.38