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Note 8 - Related-Party Transactions (Details Textual) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Apr. 20, 2020
Mar. 31, 2020
Mar. 31, 2019
Dec. 31, 2019
Due from Related Parties, Current, Total   $ 942   $ 1,110
Tangible Asset Impairment Charges, Total   $ 5,122 $ 1,119  
Cimarron Express [Member]        
Tangible Asset Impairment Charges, Total     800  
Interest Costs Capitalized       2,000
Ergon [Member]        
Equity Method Investments       10,200
Ergon [Member] | Cimarron Express [Member]        
Noncontrolling Interest, Ownership Percentage by Parent   50.00%    
Ergon [Member]        
Revenue from Related Parties   $ 9,000 9,100  
Due from Related Parties, Current, Total   900   1,100
Contract with Customer, Liability, Total   4,800   $ 5,100
Ergon [Member] | Crude Oil Purchases [Member]        
Related Party Transaction, Purchases from Related Party   27,800 $ 29,700  
Due to Related Parties, Current, Total   $ 7,300    
Ergon [Member] | Crude Oil Purchases [Member] | Subsequent Event [Member]        
Payments to Related Parties $ 7,300