Condensed Consolidated Balance Sheets (Parenthetical) - $ / shares	Mar. 31, 2019	Dec. 31, 2018
Stockholders equity:
Preferred stock, par value	$ 1.00	$ 1.00
Preferred stock, authorized shares	1,000,000	1,000,000
Preferred stock, issued shares	0	0
Preferred stock, outstanding shares	0	0
Common stock, par value	$ .60	$ .60
Common stock, authorized shares	20,000,000	20,000,000
Common stock, issued shares	13,883,937	13,882,937
Common stock, outstanding shares	12,740,894	12,817,829
Treasury stock, shares	1,143,043	1,065,108