Note 9 - Stock-based Employee Compensation - Restricted Stock Unites (Details) - Restricted Stock Units (RSUs) [Member] shares in Thousands	3 Months Ended
	Mar. 31, 2022 $ / shares shares
Shares Outstanding, Beginning Balance (in shares) | shares	0
Weighted- Average Grant Date Fair Value, Outstanding, Beginning Balance (in dollars per share) | $ / shares	$ 0
Awarded (in shares) | shares	554
Awarded, Weighted- Average Grant Date Fair Value, Outstanding (in dollars per share) | $ / shares	$ 1.02
Outstanding at March 31, 2022 (in shares) | shares	554
Weighted- Average Grant Date Fair Value, Outstanding (in dollars per share) | $ / shares	$ 1.02
Vested and exercisable at March 31, 2022 (in shares) | shares	0
Vested and exercisable Weighted- Average Grant Date Fair Value (in dollars per share) | $ / shares	$ 0
Vested and expected to vest at March 31, 2022 (in shares) | shares	554
Vested and expected to vest Weighted- Average Grant Date Fair Value (in dollars per share) | $ / shares	$ 1.02