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Note 17 - Guarantor Subsidiaries - Unaudited Interim Condensed Consolidating Statements of Cash Flows (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Cash flows from operating activities | $ 94,221 | $ 115,878 | $ 225,328
Additions to properties, plants, and equipment | (136,933) | (98,038) | (164,788)
Purchase of other companies, net of cash acquired | (139,326) |  | (2,730)
Other investing activities, net | 39,711 | 1,475 | (29,946)
Dividends paid to stockholders | (4,945) | (4,528) | (4,419)
Borrowings under debt arrangements | 102,024 |  |
Repayments of debt | (113,375) | (6,986) | (11,156)
Other financing activity | 1,412 | 6,266 | 3,554
Effect of exchange rate changes on cash | (1,515) | 1,095 | (74)
Changes in cash, cash equivalents and restricted cash and cash equivalents | (158,725) | 15,162 | 15,769
Cash, cash equivalents and restricted cash and cash equivalents at beginning of year | 187,139 | 171,977 | 156,208
Cash, cash equivalents and restricted cash and cash equivalents at end of year | 28,414 | 187,139 | 171,977
Reportable Legal Entities [Member] | Parent Company [Member] |  |  |
Cash flows from operating activities | (23,136) | (134,900) | 85,665
Additions to properties, plants, and equipment |  |  | (348)
Purchase of other companies, net of cash acquired | (139,326) |  | (2,730)
Other investing activities, net | (186,615) | 132,118 | (30,584)
Dividends paid to stockholders | (4,945) | (4,528) | (4,419)
Borrowings under debt arrangements | 102,024 |  |
Repayments of debt | (106,036) |  |
Other financing activity | 260,422 | (2,087) | (28,476)
Effect of exchange rate changes on cash |  |  |
Changes in cash, cash equivalents and restricted cash and cash equivalents | (97,612) | (9,397) | 19,108
Cash, cash equivalents and restricted cash and cash equivalents at beginning of year | 103,878 | 113,275 | 94,167
Cash, cash equivalents and restricted cash and cash equivalents at end of year | 6,266 | 103,878 | 113,275
Reportable Legal Entities [Member] | Guarantor Subsidiaries [Member] |  |  |
Cash flows from operating activities | 38,116 | (98,046) | 82,778
Additions to properties, plants, and equipment | (90,578) | (46,570) | (93,541)
Purchase of other companies, net of cash acquired |  |  |
Other investing activities, net | 1,715 | 8,119 | 305
Dividends paid to stockholders |  |  |
Borrowings under debt arrangements |  |  |
Repayments of debt | (5,550) | (5,242) | (10,174)
Other financing activity | 33,933 | 147,199 | 3,529
Effect of exchange rate changes on cash |  |  |
Changes in cash, cash equivalents and restricted cash and cash equivalents | (22,364) | 5,460 | (17,103)
Cash, cash equivalents and restricted cash and cash equivalents at beginning of year | 32,048 | 26,588 | 43,691
Cash, cash equivalents and restricted cash and cash equivalents at end of year | 9,684 | 32,048 | 26,588
Reportable Legal Entities [Member] | Non-Guarantor Subsidiaries [Member] |  |  |
Cash flows from operating activities | 35,508 | 120,027 | 76,491
Additions to properties, plants, and equipment | (46,354) | (51,468) | (70,899)
Purchase of other companies, net of cash acquired |  |  |
Other investing activities, net | 5,072 |  | 333
Dividends paid to stockholders |  |  |
Borrowings under debt arrangements |  |  |
Repayments of debt | (1,789) | (1,744) | (982)
Other financing activity | (29,671) | (48,811) | 8,895
Effect of exchange rate changes on cash | (1,515) | 1,095 | (74)
Changes in cash, cash equivalents and restricted cash and cash equivalents | (38,749) | 19,099 | 13,764
Cash, cash equivalents and restricted cash and cash equivalents at beginning of year | 51,213 | 32,114 | 18,350
Cash, cash equivalents and restricted cash and cash equivalents at end of year | 12,464 | 51,213 | 32,114
Consolidation, Eliminations [Member] |  |  |
Cash flows from operating activities | 43,733 | 228,797 | (19,606)
Additions to properties, plants, and equipment |  |  |
Purchase of other companies, net of cash acquired |  |  |
Other investing activities, net | 219,539 | (138,762) |
Dividends paid to stockholders |  |  |
Borrowings under debt arrangements |  |  |
Repayments of debt |  |  |
Other financing activity | (263,272) | (90,035) | 19,606
Effect of exchange rate changes on cash |  |  |
Changes in cash, cash equivalents and restricted cash and cash equivalents |  |  |
Cash, cash equivalents and restricted cash and cash equivalents at beginning of year |  |  |
Cash, cash equivalents and restricted cash and cash equivalents at end of year |  |  |

X
- Definition Amount of cash and cash equivalents, and cash and cash equivalents restricted to withdrawal or usage; including, but not limited to, disposal group and discontinued operations. Cash includes, but is not limited to, currency on hand, demand deposits with banks or financial institutions, and other accounts with general characteristics of demand deposits. Cash equivalents include, but are not limited to, short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=98513485&loc=SL98516268-108586 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 24 -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3521-108585 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3044-108585 + Details
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- Definition Amount of increase (decrease) in cash, cash equivalents, and cash and cash equivalents restricted to withdrawal or usage; including effect from exchange rate change. Cash includes, but is not limited to, currency on hand, demand deposits with banks or financial institutions, and other accounts with general characteristics of demand deposits. Cash equivalents include, but are not limited to, short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 830 -SubTopic 230 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=98513438&loc=d3e33268-110906 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 24 -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3521-108585 + Details
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- Definition Amount of cash inflow (outflow) from operating activities, including discontinued operations. Operating activity cash flows include transactions, adjustments, and changes in value not defined as investing or financing activities. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 25 -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3536-108585 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 24 -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3521-108585 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3602-108585 + Details
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