Condensed Consolidated Balance Sheets (Current Period Unaudited) (Parentheticals) - $ / shares	Jun. 30, 2023	Dec. 31, 2022
Preferred stock, par value (in dollars per share)	$ 0.001	$ 0.001
Preferred stock, authorized (in shares)	10,000,000	10,000,000
Preferred stock, issued (in shares)	0	0
Preferred stock, outstanding (in shares)	0	0
Series A Preferred Stock [Member]
Preferred stock, authorized (in shares)	100,000	100,000
Preferred Undesignated [Member]
Preferred stock, authorized (in shares)	9,900,000	9,900,000
Common Class A [Member]
Common stock, par value (in dollars per share)	$ 0.001	$ 0.001
Common stock, authorized (in shares)	98,000,000	98,000,000
Common stock, issued (in shares)	10,019,888	10,019,888
Common stock, outstanding (in shares)	10,019,888	10,019,888
Common Class B [Member]
Common stock, par value (in dollars per share)	$ 0.001	$ 0.001
Common stock, authorized (in shares)	1,000,000	1,000,000
Common stock, issued (in shares)	31,938	31,938
Common stock, outstanding (in shares)	31,938	31,938
Common Class C [Member]
Common stock, par value (in dollars per share)	$ 0.001	$ 0.001
Common stock, authorized (in shares)	1,000,000	1,000,000
Common stock, issued (in shares)	31,938	31,938
Common stock, outstanding (in shares)	31,938	31,938