Note 8 - Stock-based Compensation - Restricted Stock Activity (Details) - Restricted Stock Units (RSUs) [Member] - $ / shares	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Beginning balance, unvested restricted stock units, shares (in shares)	767,048	45,003
Beginning balance, unvested restricted stock units, weighted average grant date fair value (in dollars per share)	$ 1.32	$ 1.51
Granted, unvested restricted stock units, shares (in shares)	1,040,200	807,048
Granted, unvested restricted stock units, weighted average grant date fair value (in dollars per share)	$ 1.26	$ 1.32
Forfeited, restricted stock units, shares (in shares)	0	(40,000)
Forfeited, restricted stock units, weighted average grant date fair value (in dollars per share)	$ 0	$ 1.32
Vested, restricted stock units, shares (in shares)	(45,000)	(45,003)
Vested, restricted stock units, weighted average grant date fair value (in dollars per share)	$ 1.37	$ 1.51
Ending balance, unvested restricted stock units, shares (in shares)	1,762,248	767,048
Ending balance, unvested restricted stock units, weighted average grant date fair value (in dollars per share)	$ 1.29	$ 1.32