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Note 1 - Basis of Presentation (Details Textual) - USD ($)
$ in Thousands
3 Months Ended
Jul. 02, 2020
Mar. 31, 2020
Mar. 31, 2019
Discount Rate Used in Future Net Cash Flows Relating to Proved Oil and Gas Reserves   10.00%  
Impairment of Oil and Gas Properties   $ 26,659
Share-based Payment Arrangement, Option [Member]      
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount, Total   100  
Restricted Stock [Member]      
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount, Total   1,300  
Performance Shares [Member]      
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount, Total   $ 900  
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period (Year)   3 years  
Minimum [Member] | Performance Shares [Member]      
Share-based Compensation Arrangement by Share-based Payment, Award, Percentage of Performance Shares that are Received   0.00%  
Minimum [Member] | Subsequent Event [Member]      
Percentage of Officers' Compensation, Decreased During Period 20.00%    
Percentage of Other Salaries, Decreased During Period 5.00%    
Maximum [Member] | Performance Shares [Member]      
Share-based Compensation Arrangement by Share-based Payment, Award, Percentage of Performance Shares that are Received   200.00%  
Maximum [Member] | Subsequent Event [Member]      
Percentage of Officers' Compensation, Decreased During Period 40.00%    
Percentage of Other Salaries, Decreased During Period 20.00%