Consolidated Balance Sheets (Current Period Unaudited) (Parentheticals) - USD ($) $ / shares in Thousands	Mar. 31, 2018	Dec. 31, 2017
Allowance for doubtful accounts	$ 0	$ 27,666
Valuation allowance for deferred tax asset	$ 161,576	$ 102,809
Common stock, no par value (in dollars per share)	$ 0	$ 0
Common stock, shares issued (in shares)	72,474,703	65,169,703
Common stock, shares outstanding (in shares)	72,474,703	65,169,703

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.

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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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