Note 11 - Property, Plant and Equipment - Property, Plant and Equipment by Classification (Details) - USD ($)	12 Months Ended
Dec. 31, 2021	Dec. 31, 2020
Property, plant, and equipment, gross	$ 203,000,000	$ 125,525,000
Less accumulated depreciation and amortization	(63,859,000)	(59,117,000)
Property, plant and equipment, net	$ 139,141,000	66,408,000
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	$ 17,949,000	17,374,000
Site Improvement [Member]
Property, plant and equipment, useful life (Year)	10 years
Property, plant, and equipment, gross	$ 7,157,000	7,157,000
Lab Equipment, Furniture and Fixtures, and Vehicles [Member]
Property, plant and equipment, useful life (Year)	5 years
Property, plant, and equipment, gross	$ 6,811,000	6,396,000
Demonstration Plant [Member]
Property, plant and equipment, useful life (Year)	2 years
Property, plant, and equipment, gross	$ 3,597,000	3,597,000
Leasehold Improvements [Member]
Property, plant, and equipment, gross	$ 2,802,000	2,523,000
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
Building [Member]
Property, plant and equipment, useful life (Year)	10 years
Property, plant, and equipment, gross	$ 2,543,000	2,543,000
Computer, Office Equipment, and Software [Member]
Property, plant, and equipment, gross	$ 2,332,000	1,983,000
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	$ 88,989,000	$ 13,132,000

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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