Note 6 - Property, Plant and Equipment - Property, Plant and Equipment by Classification (Details) - USD ($) $ in Thousands	9 Months Ended
Sep. 30, 2021	Dec. 31, 2020
Property, plant, and equipment, gross	$ 164,797	$ 125,525
Less accumulated depreciation and amortization	(62,634)	(59,117)
Property, plant and equipment, net	$ 102,163	66,408
Retrofit Assets [Member]
Property, plant and equipment, useful life (Year)	20 years
Property, plant, and equipment, gross	$ 70,820	70,820
Machinery and Equipment [Member]
Property, plant and equipment, useful life (Year)	10 years
Property, plant, and equipment, gross	$ 17,949	17,374
Site Improvement [Member]
Property, plant and equipment, useful life (Year)	10 years
Property, plant, and equipment, gross	$ 7,157	7,157
Lab Equipment, Furniture and Fixtures, and Vehicles [Member]
Property, plant and equipment, useful life (Year)	5 years
Property, plant, and equipment, gross	$ 6,935	6,396
Demonstration Plant [Member]
Property, plant and equipment, useful life (Year)	2 years
Property, plant, and equipment, gross	$ 3,597	3,597
Building [Member]
Property, plant and equipment, useful life (Year)	10 years
Property, plant, and equipment, gross	$ 2,543	2,543
Leasehold Improvements [Member]
Property, plant, and equipment, gross	$ 2,523	2,523
Leasehold Improvements [Member] \| Minimum [Member]
Property, plant and equipment, useful life (Year)	2 years
Leasehold Improvements [Member] \| Maximum [Member]
Property, plant and equipment, useful life (Year)	7 years
Computer, Office Equipment, and Software [Member]
Property, plant, and equipment, gross	$ 2,240	1,983
Computer, Office Equipment, and Software [Member] \| Minimum [Member]
Property, plant and equipment, useful life (Year)	3 years
Computer, Office Equipment, and Software [Member] \| Maximum [Member]
Property, plant and equipment, useful life (Year)	6 years
Construction in Progress [Member]
Property, plant, and equipment, gross	$ 51,033	$ 13,132

Amount of accumulated depreciation, depletion and amortization for physical assets used in the normal conduct of business to produce goods and services.

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