Note 3 - Net Income (Loss) Per Common Share - Antidilutive Securities (Details) - shares	3 Months Ended	12 Months Ended
	Mar. 31, 2022	Dec. 31, 2021
Total Potential Dilutive Securities (in shares)	491,597,864	454,334,941
Series A Preferred Stock [Member]
Total Potential Dilutive Securities (in shares)	0	30,743,500
Series A-1 Preferred Stock [Member]
Total Potential Dilutive Securities (in shares)	0	29,610,000
Series B Preferred Stock [Member]
Total Potential Dilutive Securities (in shares)	46,980	46,980
Series D Preferred Stock [Member]
Total Potential Dilutive Securities (in shares)	402,562,607	390,348,199
Share-Based Payment Arrangement, Option [Member]
Total Potential Dilutive Securities (in shares)	4,818,876	2,574,669
Restricted Stock Units (RSUs) [Member]
Total Potential Dilutive Securities (in shares)	81,019,401	618,004
Warrant [Member]
Total Potential Dilutive Securities (in shares)	3,150,000	393,589