Consolidated Balance Sheets (Current Period Unaudited) (Parentheticals) - USD ($) shares in Thousands, $ / shares in Thousands, $ in Thousands	Dec. 31, 2022	Dec. 31, 2021
LIFO Debit	$ 20,301	$ 19,736
Preferred Stock, No Par Value (in dollars per share)	$ 0	$ 0
Preferred Stock, Shares Authorized (in shares)	5,000	5,000
Preferred Stock, Shares Issued (in shares)	0	0
Preferred Stock, Shares Outstanding, Ending Balance (in shares)	0	0
Common Stock, No Par Value (in dollars per share)	$ 0	$ 0
Common Stock, Shares Authorized (in shares)	20,000	20,000
Common Stock, Shares, Issued (in shares)	11,130	11,124
Common Stock, Shares, Outstanding, Ending Balance (in shares)	11,130	11,124
Treasury Stock, Shares, Total (in shares)	0	0