Condensed Consolidated Balance Sheets (Current Period Unaudited) (Parentheticals) - $ / shares	Sep. 30, 2020	Dec. 31, 2019
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)	85,000	85,000
Preferred stock, shares outstanding (in shares)	85,000	85,000
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)	49,875,186	49,717,522
Common stock, shares outstanding (in shares)	49,801,510	49,626,498
Series A Redeemable Convertible Preferred Stock [Member]
Temporary equity, shares authorized (in shares)	165,000	0
Temporary equity, shares issued (in shares)	85,000	0
Temporary equity, shares outstanding (in shares)	85,000	0

Face amount or stated value per share of common stock.

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