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Note B - Recent Accounting Pronouncements (Details Textual) - USD ($) | Jun. 30, 2020 | Mar. 31, 2020 | Dec. 31, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Jan. 01, 2019 | Dec. 31, 2018
--- | --- | --- | --- | --- | --- | --- | ---
Stockholders' Equity Attributable to Parent, Ending Balance | $ (49,340,000) | $ (44,291,000) | $ (49,683,000) | $ (34,642,000) | $ (32,000,000) |  | $ (19,184,000)
Cumulative Effect, Period of Adoption, Adjustment [Member] |  |  |  |  |  |  |
Stockholders' Equity Attributable to Parent, Ending Balance |  |  |  |  |  |  | 22,000
Retained Earnings [Member] |  |  |  |  |  |  |
Stockholders' Equity Attributable to Parent, Ending Balance | 796,700,000 | 802,935,000 | 797,817,000 | 806,751,000 | 810,554,000 |  | 812,704,000
Retained Earnings [Member] | Cumulative Effect, Period of Adoption, Adjustment [Member] |  |  |  |  |  |  |
Stockholders' Equity Attributable to Parent, Ending Balance |  |  |  |  |  |  | 11,377,000
Retained Earnings [Member] | Cumulative Effect, Period of Adoption, Adjustment [Member] | Accounting Standards Update 2016-02 [Member] |  |  |  |  |  |  |
Stockholders' Equity Attributable to Parent, Ending Balance |  |  |  |  |  | $ (22,000) |
AOCI Attributable to Parent [Member] |  |  |  |  |  |  |
Stockholders' Equity Attributable to Parent, Ending Balance | $ (61,978,000) | $ (63,083,000) | $ (63,134,000) | $ (56,390,000) | $ (57,316,000) |  | (46,483,000)
AOCI Attributable to Parent [Member] | Cumulative Effect, Period of Adoption, Adjustment [Member] |  |  |  |  |  |  |
Stockholders' Equity Attributable to Parent, Ending Balance |  |  |  |  |  |  | $ (11,355,000)
AOCI Attributable to Parent [Member] | Cumulative Effect, Period of Adoption, Adjustment [Member] | Accounting Standards Update 2016-02 [Member] |  |  |  |  |  |  |
Stockholders' Equity Attributable to Parent, Ending Balance |  |  |  |  |  | $ 22,000 |

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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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