Note 2 - Summary of Significant Accounting Policies - Antidilutive Securities (Details) - shares	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Total Potential Dilutive Securities (in shares)	487,287,893	544,861,433
Series A Preferred Stock [Member]
Total Potential Dilutive Securities (in shares)	0	74,555,000
Series A-1 Preferred Stock [Member]
Total Potential Dilutive Securities (in shares)	0	73,910,000
Series B Preferred Stock [Member]
Total Potential Dilutive Securities (in shares)	46,631	46,029
Series D Preferred Stock [Member]
Total Potential Dilutive Securities (in shares)	398,222,985	392,166,023
Share-Based Payment Arrangement, Option [Member]
Total Potential Dilutive Securities (in shares)	4,848,876	2,585,500
Restricted Stock Units (RSUs) [Member]
Total Potential Dilutive Securities (in shares)	81,019,401	845,106
Warrant [Member]
Total Potential Dilutive Securities (in shares)	3,150,000	753,775