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Note 9 - Related Party Transactions (Details Textual) - USD ($)
1 Months Ended 6 Months Ended
Oct. 23, 2017
Sep. 30, 2016
Dec. 31, 2017
Jun. 30, 2017
Sep. 30, 2012
Common Stock, Par or Stated Value Per Share   $ 0.01 $ 0.01 $ 0.01  
Stock Issued During Period, Value, New Issues     $ 10,519,768    
Private Placement [Member] | Certain Purchasers [Member]          
Stock Issued During Period, Shares, New Issues 553,672        
Common Stock, Par or Stated Value Per Share $ 0.01        
Shares Issued, Price Per Share $ 19        
Proceeds from Issuance of Private Placement $ 10,500,000        
Proceeds from Issuance of Private Placement, Net of Issuance Costs $ 10,000,000        
Private Placement Fee, Percentage 6.50%        
Private Placement Fee, Reduced Percentage 3.25%        
Payments of Stock Issuance Costs $ 500,000        
JEX [Member]          
Overriding Royalty Interest     3.00%   2.00%
Management Services Agreement, Initial Term   1 year      
Management Services Agreement, Fee Per Month   $ 32,000      
JEX [Member] | Expense for Office Space and Equipment [Member]          
Management Services Agreement, Fee Per Month   $ 6,900      
JEX [Member] | Alaska [Member]          
Overriding Royalty Interest         2.00%
Juneau Exploration L.P. [Member] | Private Placement [Member]          
Stock Issued During Period, Shares, New Issues 13,200        
Stock Issued During Period, Value, New Issues $ 250,800