Note 8 - Stock-based Compensation - Summary of Outstanding Stock Options by Exercise Price Range (Details)	12 Months Ended
	Dec. 31, 2025 $ / shares shares
Shares Outstanding (in shares) | shares	71,000
Weighted-Average Remaining Contractual Life (Year)	1 year 3 months 18 days
Weighted-Average Exercise Price (in dollars per share)	$ 1.2
Range One [Member]
Lower Limit (in dollars per share)	0.965
Upper Limit (in dollars per share)	$ 1.27
Shares Outstanding (in shares) | shares	44,000
Weighted-Average Remaining Contractual Life (Year)	1 year 10 months 24 days
Weighted-Average Exercise Price (in dollars per share)	$ 0.97
Range Two [Member]
Lower Limit (in dollars per share)	1.28
Upper Limit (in dollars per share)	$ 1.58
Shares Outstanding (in shares) | shares	27,000
Weighted-Average Remaining Contractual Life (Year)	4 months 24 days
Weighted-Average Exercise Price (in dollars per share)	$ 1.58