Consolidated Balance Sheets (Current Period Unaudited) (Parentheticals) - USD ($) $ / shares in Thousands	Jun. 30, 2017	Dec. 31, 2016
Allowance for doubtful accounts	$ 27,666	$ 27,666
Valuation allowance for deferred tax asset	$ 15,289	$ 15,017
Common stock, no par value (in dollars per share)	$ 0	$ 0
Common stock, shares issued (in shares)	62,032,097	59,708,318
Common stock, shares outstanding (in shares)	62,032,097	59,708,318

A valuation allowance for trade and other receivables due to an Entity within one year (or the normal operating cycle, whichever is longer) that are expected to be uncollectible.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
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Face amount per share of no-par value common stock.

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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.

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

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Amount of valuation allowance of deferred tax asset attributable to deductible temporary differences and carryforwards, classified as noncurrent.

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