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Note 4 - Accounts Receivable, Transit Accounts Receivable and Transit Accounts Payable (Details Textual) - USD ($) $ in Thousands | 1 Months Ended | 3 Months Ended |
--- | --- | --- | ---
Apr. 30, 2020 | Mar. 28, 2020 | Dec. 28, 2019
Accounts Receivable, after Allowance for Credit Loss, Current, Total |  | $ 50,767 | $ 59,760
Loss Contingency, Receivable, Ending Balance |  |  | 14,100
Loss Contingency, Estimate of Possible Loss |  |  | 10,300
Arbitration to Settle Dispute with Major Utility [Member] |  |  |
Litigation Settlement, Expense |  | 8,000 |
Legal Fees |  | 400 |
Accounts Receivable, Allowance for Credit Loss, Writeoff |  | 700 |
Arbitration to Settle Dispute with Major Utility [Member] | Expense Related to Disputed Projects not Awards by Arbitrator [Member] |  |  |
Litigation Settlement, Expense |  | 6,700 |
Arbitration to Settle Dispute with Major Utility [Member] | Expense Related to Other Projects not Part of Arbitration [Member] |  |  |
Litigation Settlement, Expense |  | 700 |
Arbitration to Settle Dispute with Major Utility [Member] | Expense Related to Disputed Projects Part of Arbitration [Member] |  |  |
Litigation Settlement, Expense |  | 200 |
Arbitration to Settle Dispute with Major Utility [Member] | Subsequent Event [Member] |  |  |
Litigation Settlement, Amount Awarded from Other Party | $ 7,400 |  |
Collectibility of Receivables [Member] |  |  |
Loss Contingency, Estimate of Possible Loss |  |  | 10,300
Transit Accounts Receivable [Member] |  |  |
Accounts Receivable, before Allowance for Credit Loss, Current |  | 1,900 | 4,900
Accounts Payable, Current, Total |  | 2,500 |
Accounts Payable, Net |  | 600 |
Accounts Receivable, after Allowance for Credit Loss, Current, Total |  |  | 300
Transit Accounts Payable [Member] |  |  |
Accounts Payable, Current, Total |  |  | $ 4,600
Accounts Receivable not Part of Arbitration [Member] |  |  |
Accounts Receivable, Allowance for Credit Loss, Writeoff |  | $ 700 |

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- Definition Carrying value as of the balance sheet date of liabilities incurred (and for which invoices have typically been received) and payable to vendors for goods and services received that are used in an entity's business. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(a)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
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