Quarterly report pursuant to Section 13 or 15(d)

Consolidated Balance Sheets (Parenthetical)

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Consolidated Balance Sheets (Parenthetical) - USD ($)
Sep. 30, 2018
Dec. 31, 2017
Statement of Financial Position [Abstract]    
Property, buildings and equipment, accumulated depreciation $ 41,895,029 $ 38,927,654
Finite-lived intangible assets, accumulated amortization $ 309,259 $ 263,134
Preferred stock, par value (usd per share) $ 1 $ 1
Preferred stock, shares authorized 5,000,000 5,000,000
Preferred stock, shares issued 0 0
Common stock, par value (usd per share) $ 0.1 $ 0.1
Common stock, shares authorized 40,000,000 40,000,000
Common stock, shares issued 27,813,772 27,813,772
Common stock, shares outstanding 25,451,354 25,451,354
Treasury stock, shares 2,362,418 2,362,418