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Note 4 - Accounts Receivable, Transit Accounts Receivable and Transit Accounts Payable (Details Textual) - USD ($)
$ in Millions
Mar. 31, 2018
Dec. 30, 2017
Liabilities, Net $ 0.4 $ 1.7
Loss Contingency, Receivable, Ending Balance 5.9  
Loss Contingency, Estimate of Possible Loss 9.3  
Collectibility of Receivables [Member]    
Loss Contingency, Estimate of Possible Loss 9.3  
Transit Accounts Payable [Member]    
Accounts Payable, Current, Total 1.5 4.7
Transit Accounts Receivable [Member]    
Accounts Receivable, Gross, Current $ 1.1 $ 3.0