Condensed Consolidated Balance Sheets (Unaudited) (Parenthetical) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Current Assets:
Accounts receivable, allowances	$ 191	$ 189
Stockholders’ Equity
Common stock, par value (in dollars per share)	$ 0.01	$ 0.01
Common stock, shares authorized (in shares)	10,000,000	10,000,000
Common stock, shares issued (in shares)	5,383,300	5,409,550
Common stock, shares outstanding (in shares)	5,272,204	5,272,204
Treasury stock, (in shares)	81,584	81,584