Note 6 - Earnings Per Common Share - Antidilutive Securities (Details) - shares shares in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Antidilutive securities (in shares)	72,305	66,660	35,880	66,660
Share-Based Payment Arrangement, Option [Member]
Antidilutive securities (in shares)	25,534	23,580	25,534	23,580
Warrant [Member]
Antidilutive securities (in shares)	10,346	10,346	10,346	10,346
Convertible Debt Securities [Member]
Antidilutive securities (in shares)	36,425	32,734	0	32,734