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Consolidated Balance Sheets (Parentheticals) - USD ($) $ / shares in Thousands | Dec. 31, 2022 | Dec. 31, 2021
--- | --- | ---
Allowance for doubtful accounts | $ 100,000 | $ 100,000
Asset retirement obligations |  | $ 107,000
Common stock, no par value (in dollars per share) | $ 0 | $ 0
Common stock, shares authorized (in shares) | 10,000,000 | 10,000,000
Common stock, shares issued (in shares) | 6,184,000 | 6,049,000
Common stock, shares outstanding (in shares) | 6,184,000 | 6,049,000

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