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Note 2 - Oil and Gas Leases (Tables)
 12 Months Ended
Dec. 31, 2015
Notes Tables  
Results of Operations for Oil and Gas Producing Activities Disclosure [Table Text Block]
   
2015
    
20
14
  
Gross revenues
                
Royalty interests
   $ 772,212     $ 1,366,281  
Lease Fees
     13,992       117,499  
      786,204       1,483,780  
Production costs
     70,240       97,702  
Results before income tax expense
     715,964       1,386,078  
Estimated income tax expense (40%)
     286,386       554,431  
Results of operations from producing activities excluding corporate overhead
   $ 429,578     $ 831,647  
Oil and Gas Net Production, Average Sales Price and Average Production Costs Disclosure [Table Text Block]
   
2015
    
2014
  
                 
Net gas produced (MCF)
     50,304       46,457  
Net oil produced (Bbl)
     11,145       10,593