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Consolidated Balance Sheets (Parentheticals) - USD ($) $ in Thousands | Dec. 31, 2016 | Dec. 31, 2015
--- | --- | ---
Accounts receivable allowance | $ 1,345 | $ 1,857
Drivers' advances and other receivables, allowance | $ 519 | $ 1,005
Treasury stock, shares (in shares) | 23,656 | 149,498
Common Class A [Member] |  |
Par value (in dollars per share) | $ 0.01 | $ 0.01
Shares authorized (in shares) | 20,000,000 | 20,000,000
Shares issued (in shares) | 15,922,879 | 15,922,879
Shares outstanding (in shares) | 15,899,223 | 15,773,381
Common Class B [Member] |  |
Par value (in dollars per share) | $ 0.01 | $ 0.01
Shares authorized (in shares) | 5,000,000 | 5,000,000
Shares issued (in shares) | 2,350,000 | 2,350,000
Shares outstanding (in shares) | 2,350,000 | 2,350,000

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