(Parentheticals) - USD ($)	Dec. 31, 2015	Dec. 31, 2014
Assets [Abstract]
Allowance for Doubtful Accounts Receivable, Current	$ 4,527,000	$ 5,706,000
Liabilities and Equity [Abstract]
Common Stock, No Par Value	$ 0.00	$ 0.00
Common Stock, Shares Authorized	120,000,000	120,000,000
Treasury Stock, Shares	1,339,583	1,504,064
Common Stock, Shares, Issued	55,253,092	55,253,092