Amount of expense for award under share-based payment arrangement. Excludes amount capitalized.

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Note 7 - Stock-based Compensation (Details Textual) - USD ($)	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2025	Jun. 30, 2024	Jun. 30, 2025	Jun. 30, 2024	Dec. 31, 2024	May 31, 2022
Share-Based Payment Arrangement, Expense	$ 96,000	$ 131,000	$ 163,000	$ 219,000
Restricted Stock Units (RSUs) [Member]
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount	0		0
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Grants in Period (in shares)				3,033
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value (in dollars per share)				$ 34.07
Share-Based Compensation Arrangement by Share-Based Payment Award, Award Vesting Period (Year)				1 year
Share-Based Payment Arrangement, Expense	0	$ 25,000	$ 14,000	$ 37,000
Stock Option Plan 2022 [Member]
Share-Based Compensation Arrangement by Share-Based Payment Award, Number of Shares Authorized (in shares)						576,550
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Grants in Period, Gross (in shares)			0	107,200	107,200
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount	$ 1,100,000		$ 1,100,000
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition (Year)			2 years 10 months 24 days
Stock Option Plan 2013 [Member]
Share-Based Compensation Arrangement by Share-Based Payment Award, Number of Shares Available for Grant (in shares)						126,550
Common Stock, Capital Shares Reserved for Future Issuance (in shares)	102,192		102,192
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount	$ 0		$ 0