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Note 1 - Summary of Significant Accounting Policies (Details Textual) $ in Thousands	12 Months Ended
	Dec. 31, 2020 USD ($)	Dec. 31, 2019 USD ($)
Number of Operating Segments	1
Other than Temporary Impairment Losses, Investments, Total	$ 0
Goodwill, Impairment Loss	$ 0	$ 0
Equipment [Member] | Minimum [Member]
Property, Plant and Equipment, Useful Life (Year)	3 years
Equipment [Member] | Maximum [Member]
Property, Plant and Equipment, Useful Life (Year)	7 years
Building [Member] | Minimum [Member]
Property, Plant and Equipment, Useful Life (Year)	15 years
Building [Member] | Maximum [Member]
Property, Plant and Equipment, Useful Life (Year)	39 years

X

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Amount of loss from the write-down of an asset representing the future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

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