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Note 3 - Company Operations (Tables)
6 Months Ended
Jun. 30, 2018
Notes Tables  
Schedule of Segment Reporting Information, by Segment [Table Text Block]
   
2018
   
2017
 
Revenues
               
Oil and Gas
  $
286,255
    $
333,362
 
Timber
   
355,008
     
8,966
 
Surface
   
99,465
     
253,448
 
Total
   
740,728
     
595,776
 
Cost and Expenses
               
Oil and Gas
   
29,943
     
33,049
 
Timber
   
35,378
     
6,107
 
Surface
   
14,506
     
24,848
 
Total
   
79,824
     
64,004
 
Income from Operations
               
Oil and Gas
   
256,312
     
300,313
 
Timber
   
319,630
     
2,859
 
Surface
   
84,962
     
228,600
 
Total
   
660,904
     
531,772
 
Other Income (Expense) before Income Taxes
   
328,161
     
(273,672
)
Income before Income Taxes
   
989,065
     
258,100
 
                 
Identifiable Assets, net of accumulated depreciation and depletion
               
Oil and Gas
   
--
     
--
 
Timber
   
2,134,230
     
2,119,180
 
Surface
   
--
     
--
 
General Corporate Assets
   
13,286,517
     
12,604,557
 
Total
   
15,420,747
     
14,723,737
 
                 
Capital Expenditures
               
Oil and Gas
   
--
     
--
 
Timber
   
29,763
     
11,040
 
Surface
   
--
     
--
 
General Corporate Assets
   
10,371
     
--
 
Total
   
40,134
     
11,040
 
                 
Depreciation and Depletion
               
Oil and Gas
   
--
     
--
 
Timber
   
14,713
     
--
 
Surface
   
--
     
--
 
General Corporate Assets
   
467
     
467
 
Total
  $
15,180
    $
467
 
Schedule of Revenue by Major Customers by Reporting Segments [Table Text Block]
Count
   
2018
   
2017
 
1     $
250,334
    $
179,292
 
2      
77,137
     
80,210
 
3      
73,110
     
54,154
 
4      
47,567
     
42,513
 
5      
38,333
     
38,333