Note 8 - Stock-based Compensation - Restricted Stock Activity (Details) - $ / shares	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023
Balance, unvested restricted stock units, shares (in shares)	1,082,122
Balance, unvested restricted stock units, weighted average grant date fair value (in dollars per share)	$ 1.26
Granted, unvested restricted stock units, shares (in shares)		151,000
Granted, unvested restricted stock units, weighted average grant date fair value (in dollars per share)		$ 1.09
Forfeited, restricted stock units, shares (in shares)		(425,100)
Forfeited, restricted stock units, weighted average grant date fair value (in dollars per share)		$ 1.26
Vested, restricted stock units, shares (in shares)		(406,026)
Vested, restricted stock units, weighted average grant date fair value (in dollars per share)		$ 1.32
Balance, unvested restricted stock units, shares (in shares)		1,082,122
Balance, unvested restricted stock units, weighted average grant date fair value (in dollars per share)		$ 1.26
Restricted Stock Units (RSUs) [Member]
Balance, unvested restricted stock units, shares (in shares)	767,048
Balance, unvested restricted stock units, weighted average grant date fair value (in dollars per share)	$ 1.32
Granted, unvested restricted stock units, shares (in shares)	1,040,200
Granted, unvested restricted stock units, weighted average grant date fair value (in dollars per share)	$ 1.26
Forfeited, restricted stock units, shares (in shares)	0
Forfeited, restricted stock units, weighted average grant date fair value (in dollars per share)	$ 0
Vested, restricted stock units, shares (in shares)	(45,000)
Vested, restricted stock units, weighted average grant date fair value (in dollars per share)	$ 1.37
Balance, unvested restricted stock units, shares (in shares)	1,762,248	767,048
Balance, unvested restricted stock units, weighted average grant date fair value (in dollars per share)	$ 1.29	$ 1.32