Note 10 - Disposition of Assets and Restructuring (Details Textual) - USD ($)	Jan. 03, 2022	Jun. 30, 2022	Dec. 31, 2021
Annual Rate of Return, Percent	6.00%
Preferred Stock, Par or Stated Value Per Share (in dollars per share)		$ 0.01	$ 0.01
Series A Preferred Stock [Member]
Stock Issued During Period, Shares, New Issues (in shares)	685,505
Capital Stock, Proceed Distribution Allocation, Percentage to Shares, Tier One	100.00%
Maximum Aggregate Proceeds Received Allowed, Tier One Preference Amount	$ 100,000,000
Capital Stock, Proceed Distribution Allocation, Percentage to Shares, Tier Two	95.00%
Maximum Aggregate Proceeds Received Allowed, Tire Two Preference Amount	$ 137,100,000
Capital Stock, Proceed Distribution Allocation, Percentage to Shares, Tier Three	75.00%
Number of Votes Each Share Entitled	69
Preferred Stock, Voting Power, Percent	85.00%
Preferred Stock, Par or Stated Value Per Share (in dollars per share)	$ 0.01
Common Stock [Member]
Capital Stock, Proceed Distribution Allocation, Percentage to Shares, Tier Two	5.00%
Capital Stock, Proceed Distribution Allocation, Percentage to Shares, Tier Three	25.00%
Lime Rock Resources V-A, L.P. [Member]
Proceeds from Sale of Property, Plant, and Equipment, Total	$ 87,200,000
AGEF [Member]
Maximum Additional Funding	$ 12,000,000.0
AGEF [Member] | Series A Preferred Stock [Member]
Stock Issued During Period, Shares, New Issues (in shares)	685,505