Note 5 - Shareholders' Equity - Preferred Stock Rollforward (Details)	3 Months Ended
	Mar. 31, 2022 USD ($)
Series A Preferred Stock [Member]
Balance	$ 3,155,000
Accrued Deemed Dividends	100,000
Balance	3,255,000
Series B Preferred Stock [Member]
Balance	1,715,000
Accrued Deemed Dividends	34,000
Balance	1,749,000
Series C Preferred Stock [Member]
Balance	1,630,000
Accrued Deemed Dividends	34,000
Balance	1,664,000
Series D Preferred Stock [Member]
Balance	1,512,000
Accrued Deemed Dividends	34,000
Balance	$ 1,546,000