Condensed Consolidated Balance Sheets (Current Period Unaudited) (Parentheticals) - $ / shares	Jun. 30, 2022	Dec. 31, 2021
Preferred stock, par value (in dollars per share)	$ 0.0001	$ 0.0001
Preferred stock, shares authorized (in shares)	1,000,000	1,000,000
Preferred stock, shares issued (in shares)	62,000	80,000
Preferred stock, shares outstanding (in shares)	62,000	80,000
Common stock, par value (in dollars per share)	$ 0.0001	$ 0.0001
Common stock, shares authorized (in shares)	200,000,000	200,000,000
Common stock, shares issued (in shares)	53,064,077	50,800,786
Common stock, shares outstanding (in shares)	53,018,837	50,755,546
Series A Redeemable Convertible Preferred Stock [Member]
Temporary equity, shares authorized (in shares)	165,000	165,000
Temporary equity, shares issued (in shares)	62,000	80,000
Temporary equity, shares outstanding (in shares)	62,000	80,000
Preferred stock, shares outstanding (in shares)	62,000

Face amount or stated value per share of common stock.

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

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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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