CONDENSED CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($)	Jun. 30, 2017	Dec. 31, 2016
Statement of Financial Position [Abstract]
Allowances on accounts receivable	$ 359,475	$ 260,676
Accumulated depreciation	$ 18,387,382	$ 18,580,547
Series A Redeemable convertible preferred stock, par value	$ 0.001	$ 0.001
Series A Redeemable convertible preferred stock, shares authorized	2,000,000	2,000,000
Series A Redeemable convertible preferred stock, shares issued	900,000	900,000
Series A Redeemable convertible preferred stock, shares outstanding	900,000	900,000
Series A redeemable convertible preferred stock, redemption value	$ 9,000,000	$ 9,000,000
Common stock, par value	$ 0.001	$ 0.001
Common stock, shares authorized	100,000,000	100,000,000
Common stock, shares issued	60,054,060	59,482,989
Common stock, shares outstanding	44,525,990	43,954,919
Common Stock held in treasury, shares	15,528,070	15,528,070

Amount of accumulated depreciation, depletion and amortization for physical assets used in the normal conduct of business to produce goods and services.

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A valuation allowance for trade and other receivables due to an Entity within one year (or the normal operating cycle, whichever is longer) that are expected to be uncollectible.

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Face amount or stated value per share of common stock.

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Carrying amount, attributable to parent and noncontrolling interests, of an entity's issued and outstanding stock which is not included within permanent equity. Temporary equity is a security with redemption features that are outside the control of the issuer, is not classified as an asset or liability in conformity with GAAP, and is not mandatorily redeemable. Includes any type of security that is redeemable at a fixed or determinable price or on a fixed or determinable date or dates, is redeemable at the option of the holder, or has conditions for redemption which are not solely within the control of the issuer. Includes stock with a put option held by an ESOP and stock redeemable by a holder only in the event of a change in control of the issuer.

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Per share amount of par value or stated value of stock classified as temporary equity. Temporary equity is a security with redemption features that are outside the control of the issuer, is not classified as an asset or liability in conformity with GAAP, and is not mandatorily redeemable.

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