XML 19 R5.htm IDEA: XBRL DOCUMENT v3.19.1
Consolidated Balance Sheets (Parenthetical) - USD ($)
Dec. 31, 2018
Dec. 31, 2017
Current assets:    
Allowance for Doubtful Accounts Receivable, Current $ 25,000 $ 0
Stockholders' Equity:    
Preferred stock, par value (USD per share) $ 0.01 $ 0.01
Preferred stock, shares authorized 10,000,000 10,000,000
Preferred stock, shares outstanding 0 0
Common stock, par value (USD per share) $ 0.01 $ 0.01
Common stock, shares authorized 20,000,000 20,000,000
Common stock, shares outstanding 7,776,164 7,711,277
Treasury Stock, Shares 3,790,308 3,773,128