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Consolidated Balance Sheets (Parentheticals) - $ / shares	Dec. 31, 2020	Dec. 31, 2019
Preferred stock par value (USD per share)	$ 0.01	$ 0.01
Preferred stock shares authorized (in shares)	100,000,000	100,000,000
Preferred stock shares issued (in shares)	0	0
Preferred stock shares outstanding (in shares)	0	0
Class A Common Stock
Common stock par value (USD per share)	$ 0.01	$ 0.01
Common stock shares authorized (in shares)	100,000,000
Common stock shares issued (in shares)	11,601,757	11,601,757
Class B Common Stock
Common stock par value (USD per share)	$ 0.01	$ 0.01
Common stock shares authorized (in shares)	1,800,000,000
Common stock shares issued (in shares)	260,552,747	243,241,192

X

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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.

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Face amount or stated value per share of preferred stock nonredeemable or redeemable solely at the option of the issuer.

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Total number of nonredeemable preferred shares (or preferred stock redeemable solely at the option of the issuer) issued to shareholders (includes related preferred shares that were issued, repurchased, and remain in the treasury). May be all or portion of the number of preferred shares authorized. Excludes preferred shares that are classified as debt.

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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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