Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Current Assets:
Accounts receivable, allowances	$ 31	$ 34
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)	2,757,050	2,745,098
Common stock, shares outstanding (in shares)	2,675,466	2,665,434
Treasury stock, (in shares)	81,584	79,664