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Note 9 - Stock Option and Stock Plans (Tables)
12 Months Ended
Dec. 31, 2016
Notes Tables  
Schedule of Share-based Compensation, Stock Options, Activity [Table Text Block]
Stock Plans *
 
Issue Date Range
 
 
Total Shares
Authorized
 
 
Share
s
Issued
 
 
Shares
Remaining
 
2008 Stock Incentive Plan
 
5/23/08 
10/11/11
     
600,000
     
463,420
     
136,580