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Note 9 - Commitments and Contingencies (Details Textual) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2002
Aug. 31, 2018
Aug. 31, 2017
Stock Repurchased During Period, Value $ 130 $ 276      
Former Chief Operating Officer [Member          
Severance Costs   235      
Severance Payment   $ 60      
August 2017 Repurchase Program [Member]          
Stock Repurchase Program, Authorized Amount         $ 250
Stock Repurchased During Period, Shares   55,199      
Stock Repurchased During Period, Value   $ 201      
August 2018 Repurchase Program [Member]          
Stock Repurchase Program, Authorized Amount       $ 250  
Stock Repurchased During Period, Shares 32,769 21,002      
Stock Repurchased During Period, Value $ 133 $ 83      
Officers [Member]          
Disability and Life Insurance Plans, Period     3 years    
Other Participants Except Officers [Member]          
Disability and Life Insurance Plans, Period     2 years