Note 2 - Description of Business and Summary of Significant Accounting Policies - Useful Life of Property, Plant and Equipment (Details)	Dec. 31, 2025
Machinery and Equipment [Member] \| Minimum [Member]
Property, Plant and Equipment, Useful Life (Year)	7 years
Machinery and Equipment [Member] \| Maximum [Member]
Property, Plant and Equipment, Useful Life (Year)	10 years
Solar System Facilities [Member] \| Minimum [Member]
Property, Plant and Equipment, Useful Life (Year)	14 years
Solar System Facilities [Member] \| Maximum [Member]
Property, Plant and Equipment, Useful Life (Year)	30 years
Computer Software and Development [Member] \| Minimum [Member]
Property, Plant and Equipment, Useful Life (Year)	2 years
Computer Software and Development [Member] \| Maximum [Member]
Property, Plant and Equipment, Useful Life (Year)	5 years
Computers and Computer Hardware [Member] \| Minimum [Member]
Property, Plant and Equipment, Useful Life (Year)	2 years
Computers and Computer Hardware [Member] \| Maximum [Member]
Property, Plant and Equipment, Useful Life (Year)	5 years
Office Equipment and Other [Member] \| Minimum [Member]
Property, Plant and Equipment, Useful Life (Year)	4 years
Office Equipment and Other [Member] \| Maximum [Member]
Property, Plant and Equipment, Useful Life (Year)	27 years