Note 6 - Stockholders' Equity (Tables)

3 Months Ended

Mar. 31, 2024

Notes Tables

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

	Stock Options			Restricted Stock
Equity awards outstanding, beginning of year		4,697,029			9,639,068
Changes during the year:
Granted		—			3,304,468
Exercised or vested		(2,500	)		(1,379,543	)
Expired or Forfeited		—			(165,514	)
Equity awards outstanding, end of period		4,694,529			11,398,479

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

(in thousands)	​Stock Options	Restricted Stock
Unrecognized compensation cost	$3,309	$55,066
Expected weighted-average period in years of compensation cost to be recognized	2.3	3.2