Condensed Consolidated Balance Sheets (Current Period Unaudited) (Parentheticals) - USD ($)	Mar. 31, 2024	Dec. 31, 2023
Accounts receivable, allowance for doubtful accounts	$ 4,000	$ 4,000
Preferred stock, par value (in dollars per share)	$ 0.001	$ 0.001
Preferred stock, shares authorized (in shares)	2,000,000	2,000,000
Preferred stock, shares outstanding (in shares)	0	0
Common stock, par value (in dollars per share)	$ 0.001	$ 0.001
Common stock, shares authorized (in shares)	350,000,000	350,000,000
Common Stock, Shares, Outstanding (in shares)	7,952,780	3,617,886
Common Stock, Shares, Issued (in shares)	7,952,780	3,617,886