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Condensed Consolidated Balance Sheets (Parentheticals) - USD ($)
$ in Thousands
Mar. 31, 2025
Dec. 31, 2024
Statement of Financial Position [Abstract]    
Accounts receivable, allowance $ 102 $ 50
Property, plant and equipment, accumulated depreciation $ 38,716 $ 37,635
Common stock, par value (in dollars per share) $ 1 $ 1
Common stock, shares authorized (in shares) 25,000,000 25,000,000
Common stock, shares issued (in shares) 12,221,484 12,221,484
Common stock, shares outstanding (in shares) 7,364,430 7,357,450
Treasury store shares at cost (in shares) 4,857,054 4,864,034