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Note 7 - Accumulated Other Comprehensive Loss - Accumulated Other Comprehensive Loss Reported in the Consolidated Balance Sheets (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Balance | $ 307,878 | $ 293,132 | $ 325,495
Reclassification of stranded income tax effects in accumulated other comprehensive income |  |  | 0
Balance | 315,513 | 307,878 | 293,132
Accumulated Foreign Currency Adjustment Attributable to Parent [Member] |  |  |
Balance | (8,155) | (8,243) | (5,321)
Reclassification of stranded income tax effects in accumulated other comprehensive income |  |  | 0
Reclassification adjustments | 0 | 0 | 0
Current period benefit (charge) | 3,111 | 88 | (2,922)
Income tax charge (benefit) | 0 | 0 | 0
Current period benefit (charge) | 3,111 | 88 | (2,922)
Income tax charge (benefit) | 0 | 0 | 0
Income tax charge (benefit) | 0 | (0) | (0)
Balance | (5,044) | (8,155) | (8,243)
Accumulated Defined Benefit Plans Adjustment Attributable to Parent [Member] |  |  |
Balance | (20,382) | (15,180) | (7,188)
Reclassification of stranded income tax effects in accumulated other comprehensive income |  |  | (2,070)
Reclassification adjustments | 7,049 | 1,753 | 4,016
Current period benefit (charge) | (13,510) | (8,521) | (9,644)
Income tax charge (benefit) | (1,510) | 1,566 | (294)
Current period benefit (charge) | (13,510) | (8,521) | (9,644)
Income tax charge (benefit) | (1,510) | 1,566 | (294)
Income tax charge (benefit) | 1,510 | (1,566) | 294
Balance | (25,333) | (20,382) | (15,180)
AOCI Attributable to Parent [Member] |  |  |
Balance | (28,537) | (23,423) | (12,509)
Reclassification of stranded income tax effects in accumulated other comprehensive income |  |  | (2,070)
Reclassification adjustments | 7,049 | 1,753 | 4,016
Current period benefit (charge) | (10,399) | (8,433) | (12,566)
Income tax charge (benefit) | (1,510) | 1,566 | (294)
Current period benefit (charge) | (10,399) | (8,433) | (12,566)
Income tax charge (benefit) | (1,510) | 1,566 | (294)
Income tax charge (benefit) | 1,510 | (1,566) | 294
Balance | $ (30,377) | $ (28,537) | $ (23,423)

X
- Definition Amount of current period charge (benefit) before tax of other comprehensive income (loss) attributable to parent entity. + References No definition available. + Details
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- Definition Amount of increase (decrease) in accumulated other comprehensive income (AOCI) for reclassification to retained earnings of tax effect from remeasurement of deferred tax pursuant to Tax Cuts and Jobs Act. + References No definition available. + Details
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- Definition Total of all stockholders' equity (deficit) items, net of receivables from officers, directors, owners, and affiliates of the entity which are attributable to the parent. The amount of the economic entity's stockholders' equity attributable to the parent excludes the amount of stockholders' equity which is allocable to that ownership interest in subsidiary equity which is not attributable to the parent (noncontrolling interest, minority interest). This excludes temporary equity and is sometimes called permanent equity. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08(g)(1)(ii)) -URI http://asc.fasb.org/extlink&oid=120395691&loc=d3e23780-122690 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SAB Topic 4.E) -URI http://asc.fasb.org/extlink&oid=27010918&loc=d3e74512-122707 Reference 3: 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(31)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 Reference 4: 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(29)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 Reference 5: 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(30)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 Reference 6: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 28 -Subparagraph (f) -URI http://asc.fasb.org/extlink&oid=75031198&loc=d3e14064-108612 Reference 7: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 323 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=114001798&loc=d3e33918-111571 + Details
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