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Note 16 - Contingencies (Details Textual) - USD ($) $ in Thousands | 1 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Apr. 30, 2020 | Sep. 26, 2020 | Dec. 28, 2019
Estimated Litigation Liability |  | $ 0 |
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, Amount Awarded from Other Party | $ 7,400 |  |
Litigation Settlement, Expense |  | 8,400 |
Legal Fees |  | 800 |
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 |

X
- Definition Amount of direct write-downs of accounts receivable charged against the allowance. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 50 -Paragraph 13 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=121599337&loc=SL82919249-210447 + Details
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- Definition Aggregate carrying amount of the estimated litigation liability for known or estimated probable loss from litigation, which may include attorneys' fees and other litigation costs. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 450 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=121557415&loc=d3e14326-108349 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.25) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
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