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Consolidated Balance Sheets (Parentheticals) - USD ($) | Dec. 31, 2021 | Dec. 31, 2020
--- | --- | ---
Allowance for doubtful accounts | $ 64,000 | $ 71,000
Common stock, par value (in dollars per share) | $ 0.01 | $ 0.01
Common stock, shares authorized (in shares) | 50,000,000 | 50,000,000
Common stock, shares outstanding (in shares) | 13,115,341 | 13,419,847

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