Note 7 - Stock Based Compensation - Summary of Stock Based Compensation Activity (Details) - $ / shares	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023
Options outstanding, number of options (in shares)	250	417
Options outstanding, Weighted Average Exercise Price (in dollars per share)	$ 1,950	$ 5,745
Options exercisable, number of options (in shares)	166	250
Options exercisable, Weighted Average Exercise Price (in dollars per share)	$ 1,950	$ 8,275
Vested, outstanding, number of options (in shares)	0	0
Vested, outstanding, Weighted Average Exercise Price (in dollars per share)	$ 0	$ 0
Vested exercisable, number of options (in shares)	84	83
Vested exercisable, Weighted Average Exercise Price (in dollars per share)	$ 1,950	$ 1,950
Expired, outstanding, number of options (in shares)	(250)	(167)
Expired, outstanding, Weighted Average Exercise Price (in dollars per share)	$ 1,950	$ 11,436
Expired exercisable, number of options (in shares)	(250)	(167)
Expired exercisable, Weighted Average Exercise Price (in dollars per share)	$ 1,950	$ 11,436
Options outstanding, number of options (in shares)	0	250
Options outstanding, Weighted Average Exercise Price (in dollars per share)	$ 0	$ 1,950
Options exercisable, number of options (in shares)	0	166
Options exercisable, Weighted Average Exercise Price (in dollars per share)	$ 0	$ 1,950