Condensed Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands	Jun. 30, 2015	Dec. 31, 2014
Accounts receivable, allowance for uncollectibles	$ 433	$ 402
Common stock, par value	$ 0.01	$ 0.01
Common stock, authorized shares	10,000,000	10,000,000
Common stock, issued shares	6,903,000	6,826,000
Treasury stock, common shares	902,000	885,000
Preferred Stock $100 Par Value [Member]
Preferred shares, par value	$ 100	$ 100
Preferred shares, authorized shares	5,000	5,000
Preferred shares, issued shares	5,000	5,000
Preferred Stock $0.01 Par Value [Member]
Preferred shares, par value	$ 0.01	$ 0.01
Preferred shares, authorized shares	10,000,000	10,000,000
Preferred shares, unissued shares	10,000,000	10,000,000