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Note 13 - Income (Loss) Per Common Share (Details Textual) - $ / shares	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2017	Dec. 31, 2015
Common Stock, Shares Authorized	750,000,000	750,000,000
Common Stock, Par or Stated Value Per Share	$ 0.25	$ 0.25
Common Stock, Shares, Issued		403,705,875
Treasury Stock, Shares	3,941,210	4,529,450
Common Stock, Shares, Outstanding	395,286,875	399,176,425
Preferred Stock, Shares Outstanding	157,816	157,816
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number	0	0	0
Class of Warrant or Right, Outstanding	0	0
Restricted Stock Units (RSUs) [Member]
Incremental Common Shares Attributable to Dilutive Effect of Share-based Payment Arrangements	4,309,440
Deferred Shares [Member]
Incremental Common Shares Attributable to Dilutive Effect of Share-based Payment Arrangements	635,602

X

- Definition

Number of warrants or rights outstanding.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 235
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.4-08.(i))
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- Definition

Face amount or stated value per share of common stock.

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The maximum number of common shares permitted to be issued by an entity's charter and bylaws.

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Total number of common shares of an entity that have been sold or granted to shareholders (includes common shares that were issued, repurchased and remain in the treasury). These shares represent capital invested by the firm's shareholders and owners, and may be all or only a portion of the number of shares authorized. Shares issued include shares outstanding and shares held in the treasury.

+ References

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Number of shares of common stock outstanding. Common stock represent the ownership interest in a corporation.

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Additional shares included in the calculation of diluted EPS as a result of the potentially dilutive effect of share based payment arrangements using the treasury stock method.

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Aggregate share number for all nonredeemable preferred stock (or preferred stock redeemable solely at the option of the issuer) held by stockholders. Does not include preferred shares that have been repurchased.

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Number of options outstanding, including both vested and non-vested options.

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Number of common and preferred shares that were previously issued and that were repurchased by the issuing entity and held in treasury on the financial statement date. This stock has no voting rights and receives no dividends.

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