CONSOLIDATED BALANCE SHEETS [Parenthetical] - USD ($)	Sep. 30, 2018	Dec. 31, 2017	Sep. 30, 2017
Allowance for Doubtful Accounts (in dollars)	$ 0	$ 1,566,578	$ 0
Accumulated depreciation (in dollars)	$ 19,356,833	$ 19,045,405	$ 18,958,502
Common stock, par value (in dollars per share)	$ 0.30	$ 0.30	$ 0.30
Common stock, shares authorized	2,000,000	2,000,000	2,000,000
Common stock, shares issued	583,094	583,094	583,094
Common stock, shares outstanding	519,600	519,600	519,600
Treasury stock, shares	63,494	63,494	63,494