Note 9 - Leases - Total Lease Expense (Details) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021 USD ($)		Jun. 30, 2021 USD ($)
Operating lease cost	$ 13		$ 39
Short-term lease expense	491	[1]	991	[1]
Total lease expense	$ 504		$ 1,030
Weighted Average Remaining Lease Term (Year)	11 years 7 months 6 days		11 years 7 months 6 days
Weighted Average Discount Rate	6.00%		6.00%
Drilling Rig [Member]
Short-term lease expense	$ 0	[2]	$ 0	[2]

[1] Short-term lease expense represents expense related to leases with a contract term of 12 months or less.

[2] These short-term lease costs are related to leases with a contract term of 12 months or less which are related to drilling rigs and are capitalized as part of natural gas and oil properties on our balance sheet.