Note 10 - Net Loss Per Share (Details Textual) - USD ($)	3 Months Ended	12 Months Ended
	Jun. 30, 2025	Dec. 31, 2024
Preferred Stock, Shares Issued (in shares)	883,000	883,000
Preferred Stock, Par or Stated Value Per Share (in dollars per share)	$ 0.001	$ 0.001
Preferred Stock, Value, Issued	$ 3,532,000	$ 3,532,000
Preferred Stock, Dividend Rate, Percentage	5.00%	5.00%
Preferred Stock, Liquidation Preference Per Share (in dollars per share)	$ 4	$ 4
Preferred Stock, Shares Outstanding (in shares)	883,000	883,000