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Condensed Consolidated Balance Sheets (Current Period Unaudited) (Parentheticals) - USD ($) $ in Thousands | Sep. 30, 2019 | Dec. 31, 2018
--- | --- | ---
Accounts receivable, allowance for doubtful accounts | $ 273 | $ 255
Common Class A [Member] |  |
Common Stock, par value (in dollars per share) | $ 0.01 | $ 0.01
Common Class B [Member] |  |
Common Stock, par value (in dollars per share) | $ 0.01 | $ 0.01

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