Shareholder Rights Plan (Narrative) (Details)	Dec. 07, 2020 $ / shares shares
Rights Agreement [Member]
Class of Warrant or Right [Line Items]
Minimum percentage of ownership of outstanding common stock to become an Acquiring Person	20.00%
Percent discount common stock may be purchased at by Right holder	50.00%
Redemption price of Right	$ 0.001
Series C Junior Participating Preferred Stock [Member]
Class of Warrant or Right [Line Items]
Preferred stock, par value	1.00
Preferred stock, price per share	$ 210.00
Series C Junior Participating Preferred Stock [Member] \| Rights Agreement [Member]
Class of Warrant or Right [Line Items]
Preferred stock shares for purchase by each Right \| shares	0.001

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Percent discount common stock may be purchased at by Right holder

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Exercise price per share or per unit of warrants or rights outstanding.

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Number of securities into which each warrant or right may be converted. For example, but not limited to, each warrant may be converted into two shares.

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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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The price per share at which the preferred stock of an entity that has priority over common stock in the distribution of dividends and in the event of liquidation of the entity is redeemed or may be called at. The redemption features of this preferred stock are solely within the control of the issuer.

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