Note 7 - Financial Instruments - Assets and Liabilities Measured at Fair Value on a Recurring Basis (Details) $ in Thousands	Dec. 31, 2021 USD ($)
Derivative liabilities	$ 442
Fair Value, Recurring [Member]
Derivative liabilities	442
Fair Value, Recurring [Member] | Fixed Price Derivative Contracts [Member]
Derivative liabilities	442
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 1 [Member]
Derivative liabilities	0
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] | Fixed Price Derivative Contracts [Member]
Derivative liabilities	0
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member]
Derivative liabilities	442
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Fixed Price Derivative Contracts [Member]
Derivative liabilities	442
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 3 [Member]
Derivative liabilities	0
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] | Fixed Price Derivative Contracts [Member]
Derivative liabilities	$ 0