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Note B - Marketable Securities (Tables)
 12 Months Ended
Dec. 31, 2017
Notes Tables  
Schedule of Available-for-sale Securities Reconciliation [Table Text Block]
December 31, 2017
   Cost   Fair Value  
Unrealized
Gain/(Loss)
Available for sale:                        
Fixed income mutual funds   $
6,003,131
     $
6,113,099
     $
109,968
  
Equity and other mutual funds    
1,128,532
      
1,608,469
      
479,937
  
Total marketable securities   $
7,131,663
     $
7,721,568
     $
589,905
  
                         
December 31, 2016                        
                         
Available for sale:                        
Fixed income mutual funds   $
9,339,352
     $
9,457,286
     $
117,934
  
Equity and other mutual funds    
612,545
      
760,723
      
148,178
  
Total marketable securities   $
9,951,897
     $
10,218,009
     $
266,112