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and Equipment Disclosure [Text Block] Acquisition holdback Noncash or Part Noncash Acquisition, Acquisition Holdback Consideration Noncash or Part Noncash Acquisition, Acquisition Holdback Consideration Number of leases with early-termination option Number of Leases With Early Termination Option Number of Leases With Early Termination Option Basic and Diluted Income (Loss) per Common Share Earnings Per Share [Text Block] Pension Plan Pension Plan [Member] Discount rate Defined Benefit Plan, Assumptions Used Calculating Benefit Obligation, Discount Rate Current liabilities: Liabilities, Current [Abstract] Federal Tax Rate Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent Equity awards withheld for tax liability (in shares) Share-based Payment Arrangement, Shares Withheld for Tax Withholding Obligation Weighted average exercise price, options vested and expected to vest (in usd per share) Share-based Compensation Arrangement by Share-based Payment 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