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Note 12 - Related Party Transactions (Details Textual) - USD ($)
$ in Millions
 1 Months Ended
Feb. 12, 2020
Jun. 30, 2020
Related Party Transaction, Proceeds From Sale of Oil and Gas Leases $ 0.4  
Majority Shareholder [Member]    
Related Party Transaction, Preliminary Reimbursement   $ 0.6
Insurance Carrier [Member]    
Related Party Transaction, Preliminary Reimbursement   $ 0.6