Current report of foreign issuer pursuant to Rules 13a-16 and 15d-16 Amendments

Note 7 - Other Equity - Stock Options Outstanding (Details)

v3.10.0.1
Note 7 - Other Equity - Stock Options Outstanding (Details)
Jun. 30, 2018
USD ($)
Dec. 31, 2017
USD ($)
Jun. 30, 2017
USD ($)
Dec. 31, 2016
USD ($)
Statement Line Items [Line Items]        
Options outstanding 4,334,000 2,344,000 2,328,000 2,005,000
Options outstanding, weighted average contractual life 8.2      
Options outstanding, weighted average exercise price $ 3.16 $ 3.46 $ 3.40 $ 4.31
Options exercisable 2,561,000      
Options exercisable, weighted average exercise price $ 3.51      
Range one [member]        
Statement Line Items [Line Items]        
Options outstanding 824,000      
Options outstanding, weighted average contractual life 8.5      
Options outstanding, weighted average exercise price $ 1.26      
Options exercisable 401,000      
Options exercisable, weighted average exercise price $ 1.28      
Range one [member] | Bottom of range [member]        
Statement Line Items [Line Items]        
Range of exercise prices 1.03      
Range one [member] | Top of range [member]        
Statement Line Items [Line Items]        
Range of exercise prices $ 2.66      
Range two [member]        
Statement Line Items [Line Items]        
Options outstanding 790,000      
Options outstanding, weighted average contractual life 9.6      
Options outstanding, weighted average exercise price $ 2.78      
Options exercisable 790,000      
Options exercisable, weighted average exercise price $ 2.78      
Range two [member] | Bottom of range [member]        
Statement Line Items [Line Items]        
Range of exercise prices 2.67      
Range two [member] | Top of range [member]        
Statement Line Items [Line Items]        
Range of exercise prices $ 2.85      
Range three [member]        
Statement Line Items [Line Items]        
Options outstanding 359,000      
Options outstanding, weighted average contractual life 7.9      
Options outstanding, weighted average exercise price $ 2.91      
Options exercisable 184,000      
Options exercisable, weighted average exercise price $ 2.91      
Range three [member] | Bottom of range [member]        
Statement Line Items [Line Items]        
Range of exercise prices 2.86      
Range three [member] | Top of range [member]        
Statement Line Items [Line Items]        
Range of exercise prices $ 3      
Range four [member]        
Statement Line Items [Line Items]        
Options outstanding 1,165,000      
Options outstanding, weighted average contractual life 9.5      
Options outstanding, weighted average exercise price $ 3.09      
Options exercisable 28,000      
Options exercisable, weighted average exercise price $ 3.70      
Range four [member] | Bottom of range [member]        
Statement Line Items [Line Items]        
Range of exercise prices 3.01      
Range four [member] | Top of range [member]        
Statement Line Items [Line Items]        
Range of exercise prices $ 3.97      
Range five [member]        
Statement Line Items [Line Items]        
Options outstanding 1,196,000      
Options outstanding, weighted average contractual life 6.1      
Options outstanding, weighted average exercise price $ 4.87      
Options exercisable 1,158,000      
Options exercisable, weighted average exercise price $ 4.86      
Range five [member] | Bottom of range [member]        
Statement Line Items [Line Items]        
Range of exercise prices 3.98      
Range five [member] | Top of range [member]        
Statement Line Items [Line Items]        
Range of exercise prices $ 32.88