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Condensed Consolidated Balance Sheets (Parentheticals) - USD ($) | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Allowance for doubtful accounts | $ 53,000 | $ 64,000 |
Common stock, par value (in dollars per share) | $ 0.01 | $ 0.01 | [1]
Common stock, shares authorized (in shares) | 50,000,000 | 50,000,000 | [1]
Common stock, shares outstanding (in shares) | 12,885,273 | 13,502,684 | [1]
[1] | The condensed consolidated balance sheet as of December 31, 2018 has been prepared using information from the audited consolidated balance sheet as of that date.

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