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Consolidated Balance Sheets (Parentheticals) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Current Assets:
Allowance for doubtful accounts	$ 9,464	$ 9,348
Class A Non-Voting
Shareholders' Investment:
Par or stated value per share (USD per share)	$ 1.00	$ 1.00
Shares authorized (shares)	50,000,000	50,000,000
Shares issued (shares)	30,847,000	30,610,000
Shares outstanding (shares)	30,847,000	30,610,000
Class B Voting
Shareholders' Investment:
Par or stated value per share (USD per share)	$ 1.00	$ 1.00
Shares authorized (shares)	50,000,000	50,000,000
Shares issued (shares)	22,510,000	22,671,000
Shares outstanding (shares)	22,510,000	22,671,000

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