Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Current Assets:
Accounts receivable, allowances	$ 189	$ 109
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)	5,409,550	5,014,647
Common stock, shares outstanding (in shares)	5,272,204	4,933,063
Treasury stock, (in shares)	81,584	81,584