Note 6 - Stockholders' Equity (Tables)

9 Months Ended

Sep. 30, 2023

Notes Tables

Share-Based Payment Arrangement, Activity [Table Text Block]

	Stock Options			Restricted Stock
Equity awards outstanding, beginning of year		5,135,685			8,732,286
Changes during the year:
Granted		—			3,570,237
Exercised or vested		(246,156	)		(2,209,888	)
Expired or Forfeited		(192,500	)		(138,059	)
Equity awards outstanding, end of period		4,697,029			9,954,576

Share-Based Payment Arrangement, Expensed and Capitalized, Amount [Table Text Block]

(in thousands)	​Stock Options		Restricted Stock
Unrecognized compensation cost	$	5,063	$	36,978
Expected weighted-average period in years of compensation cost to be recognized		2.7		2.8