Consolidated Condensed Balance Sheets (Current Period Unaudited) (Parentheticals) - USD ($) $ / shares in Thousands, $ in Thousands	Sep. 30, 2023	Dec. 31, 2022	Oct. 01, 2022
Receivables, allowance	$ 367	$ 492	$ 729
Preferred stock, shares authorized (in shares)	1,000,000	1,000,000	1,000,000
Preferred Stock, No Par Value (in dollars per share)	$ 0	$ 0	$ 0
Preferred Stock, Shares Issued (in shares)	0	0	0
Common stock, shares authorized (in shares)	30,000,000	30,000,000	30,000,000
Common stock, par value (in dollars per share)	$ 0	$ 0	$ 0
Common Stock, Shares, Issued (in shares)	13,736,800	13,594,407	13,590,407
Common stock, shares outstanding (in shares)	13,736,800	13,594,407	13,590,407