Consolidated Balance Sheets (Current Period Unaudited) (Parentheticals) - $ / shares	Mar. 31, 2023	Dec. 31, 2022
Preferred Stock, Par or Stated Value Per Share (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)	0	0
Common Stock, Par or Stated Value Per Share (in dollars per share)	$ 0.0001	$ 0.0001
Common Stock, Shares Authorized (in shares)	49,000,000	49,000,000
Common Stock, Shares, Issued (in shares)	23,200,000	23,197,000
Common Stock, Shares, Outstanding, Ending Balance (in shares)	21,542,000	21,540,000
Treasury Stock, Common, Shares (in shares)	1,658	1,657