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Note 2 - Summary of Significant Accounting Policies - Estimated Useful Lives of Property and Equipment (Details)	12 Months Ended
	Dec. 31, 2020
Minimum [Member]
Estimated useful life (Year)	5 years
Maximum [Member]
Estimated useful life (Year)	16 years
Computer Equipment and Software [Member] \| Minimum [Member]
Estimated useful life (Year)	3 years
Computer Equipment and Software [Member] \| Maximum [Member]
Estimated useful life (Year)	10 years
Furniture and Fixtures [Member] \| Minimum [Member]
Estimated useful life (Year)	5 years
Furniture and Fixtures [Member] \| Maximum [Member]
Estimated useful life (Year)	7 years
Equipment [Member] \| Minimum [Member]
Estimated useful life (Year)	5 years
Equipment [Member] \| Maximum [Member]
Estimated useful life (Year)	20 years