Note 4 - Equity - Stock Option Activity (Details) - $ / shares	3 Months Ended						9 Months Ended
	Sep. 30, 2025	Jun. 30, 2025	Mar. 31, 2025	Sep. 30, 2024	Jun. 30, 2024	Mar. 31, 2024	Sep. 30, 2025	Sep. 30, 2024
Outstanding (in shares)	5,705	5,705	5,706	5,718	5,741	5,750	5,706	5,750
Outstanding (in dollars per share)	$ 6,081.93	$ 6,081.93	$ 6,081.61	$ 6,074.65	$ 6,061.27	$ 6,054.32	$ 6,081.61	$ 6,054.32
Options expired or cancelled (in shares)	0	0	1	9	23	9	1	41
Options expired or cancelled (in dollars per share)	$ 0	$ 0	$ 4,280	$ 2,766.67	$ 2,734.78	$ 1,620	$ 4,280	$ 2,497.07
Outstanding (in shares)	5,705	5,705	5,705	5,709	5,718	5,741	5,705	5,709
Outstanding (in dollars per share)	$ 6,081.93	$ 6,081.93	$ 6,081.93	$ 6,079.87	$ 6,074.65	$ 6,061.27	$ 6,081.93	$ 6,079.87