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Note 8 - Stock Option and Stock Plans (Tables)
12 Months Ended
Dec. 31, 2017
Notes Tables  
Share-based Compensation, Stock Options, Activity [Table Text Block]
Stock Plans *
Issue Date Range
 
Total Shares
Authorized
   
Shares
Issued
   
Shares
Remaining
 
2008 Stock Incentive Plan
5/23/08
10/11/11
   
600,000
     
463,420
     
136,580