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Note 2 - Acquisition for Units (Details Textual) - USD ($)
$ in Millions
Mar. 29, 2019
Aug. 21, 2019
Limited Partners' Capital Account, Units Authorized   20,000,000
HHC [Member]    
Business Acquisition, Percentage of Net Profits Interest Acquired 96.97%  
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Property, Plant, and Equipment, Total $ 42.9  
Impairment of Oil and Gas Properties $ 4.3  
HHC [Member] | Partnership Interest [Member]    
Business Acquisition, Equity Interest Issued or Issuable, Number of Shares 2,400,000  
Business Combination, Consideration Transferred, Equity Interests Issued and Issuable $ 43.8