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Accounting Policies - Weighted average common shares outstanding (Details) - shares	6 Months Ended	12 Months Ended
	Jun. 30, 2025	Dec. 31, 2024	Dec. 31, 2023
Significant Accounting Policies
Denominator for basic net income (loss) per share - weighted average shares	1,770,000	1,770,000	1,781,000
Effect of dilutive equity awards
Stock options and restricted stock units	44,000
Denominator for diluted net income (loss) per share - weighted average shares	1,814,000	1,770,000	1,781,000

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Additional shares included in the calculation of diluted EPS as a result of the potentially dilutive effect of share based payment arrangements using the treasury stock method.

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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 718
-SubTopic 10
-Name Accounting Standards Codification
-Section 45
-Paragraph 1
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480454/718-10-45-1

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 260
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Reference 5: http://www.xbrl.org/2003/role/disclosureRef
-Topic 260
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The average number of shares or units issued and outstanding that are used in calculating diluted EPS or earnings per unit (EPU), determined based on the timing of issuance of shares or units in the period.

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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 260
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Number of [basic] shares or units, after adjustment for contingently issuable shares or units and other shares or units not deemed outstanding, determined by relating the portion of time within a reporting period that common shares or units have been outstanding to the total time in that period.

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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 260
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-Section 50
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