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Note M - Commitments and Contingencies (Tables)
12 Months Ended
Dec. 31, 2018
Notes Tables  
Schedule of Future Minimum Rental Payments for Operating Leases [Table Text Block]
Years ending December 31,
 
 
 
 
2019
   
192,000
 
2020
   
156,000
 
2021
   
127,000
 
2022
   
131,000
 
2023
   
89,000
 
    $
695,000