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Consolidated Balance Sheets (Unaudited) (Parentheticals) (USD $) In Thousands, unless otherwise specified | Jun. 30, 2013 | Dec. 31, 2012
--- | --- | ---
Allowance for doubtful accounts (in Dollars) | $ 152 | $ 336
Accumulated depreciation (in Dollars) | $ 100,638 | $ 97,883
Preferred stock, par value (in Dollars per share) (in Dollars per share) |  |
Preferred stock, shares authorized (in Shares) | 15,000 | 15,000
Preferred stock, shares outstanding (in Shares) | 0 | 0
Common Class A [Member] |  |
Common stock, par value (in Dollars per share) |  |
Common stock, shares authorized (in Shares) | 100,000 | 100,000
Common stock, shares issued (in Shares) | 23,262 | 22,916
Common stock, shares outstanding (in Shares) | 23,262 | 22,916
Common Class B [Member] |  |
Common stock, par value (in Dollars per share) |  |
Common stock, shares authorized (in Shares) | 25,000 | 25,000
Common stock, shares issued (in Shares) | 2,562 | 2,762
Common stock, shares outstanding (in Shares) | 2,562 | 2,762

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- Definition Amount of accumulated depreciation, depletion and amortization for physical assets used in the normal conduct of business to produce goods and services. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6391035&loc=d3e2868-110229 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.14) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 14 -Article 5 + Details
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