Note 3 - Net Income (Loss) Per Common Share - Antidilutive Securities (Details) - shares	9 Months Ended	12 Months Ended
	Sep. 30, 2021	Dec. 31, 2020
Total Potential Dilutive Securities (in shares)	480,343,345	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)	47,001	46,029
Series D Preferred Stock [Member]
Total Potential Dilutive Securities (in shares)	393,917,667	392,166,023
Share-based Payment Arrangement, Option [Member]
Total Potential Dilutive Securities (in shares)	83,144,875	2,585,500
Restricted Stock Units (RSUs) [Member]
Total Potential Dilutive Securities (in shares)	83,802	845,106
Warrant [Member]
Total Potential Dilutive Securities (in shares)	3,150,000	753,775