Condensed Consolidated Balance Sheets (Current Period Unaudited) (Parentheticals) - USD ($) shares in Thousands, $ in Thousands	Sep. 30, 2024	Dec. 31, 2023
Accounts Receivable, Allowance for Credit Loss, Current	$ 52	$ 64
Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment	$ 21,907	$ 23,633
Preferred Stock, Par or Stated Value Per Share (in dollars per share)	$ 0.005	$ 0.005
Preferred Stock, Shares Authorized (in shares)	873	873
Preferred Stock, Shares Issued (in shares)	0
Common stock, par value (in dollars per share)	$ 0.005	$ 0.005
Common stock, shares authorized (in shares)	50,000	50,000
Common stock, shares issued (in shares)	6,563	6,474
Common stock, shares outstanding (in shares)	5,895	5,806
Treasury stock, shares (in shares)	668	668