Note 9 - Equity - Common Stock Activity (Details)	9 Months Ended
	Sep. 30, 2021 shares
Shares outstanding (in shares)	180,089,613
Shares issued pursuant to warrant exercises (in shares)	400
Shares issued to secure financing facility (in shares)	1,000,000
Shares issued for cash (in shares)	1,000,000
Shares issued as compensation in lieu of cash (in shares)	921,218
Shares issued pursuant to RSU vesting (in shares)	860,729
Shares outstanding (in shares)	347,194,257
Conversion of Series D Preferred to Common Stock [Member]
Shares issued pursuant to conversion (in shares)	11,149,123
Conversion of Series A Preferred to Common Stock [Member]
Shares issued pursuant to conversion (in shares)	74,562,000
Conversion of Series A-1 Preferred to Common Stock [Member]
Shares issued pursuant to conversion (in shares)	73,910,000
Series A Preferred Stock Dividends [Member]
Shares issued pursuant to payment of stock dividend (in shares)	1,911,587
Series A-1 Preferred Stock Dividends [Member]
Shares issued pursuant to payment of stock dividend (in shares)	1,789,587