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EMPLOYEE STOCK OPTIONS, RESTRICTED STOCK AWARD PLAN AND 401(k) - Status of the Stock Options (Details) - $ / shares	3 Months Ended	6 Months Ended	9 Months Ended		12 Months Ended
	Mar. 31, 2019	Jun. 30, 2019	Sep. 30, 2019	Sep. 30, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options Outstanding at end of year					2,748,500
Options Exercisable at end of year					2,506,700
Weighted Average Exercise Price, Exercised				$ 3.29		$ 2.96	$ 2.63
Options Outstanding - Weighted-Average Remaining Contractual Life (in years)					4 years 2 months 12 days
Equity Option [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options Outstanding at beginning of the year	2,751,000	2,751,000	2,751,000	3,193,000	2,751,000	3,193,000	3,362,350
Options Issued	0	0	0	0	0	0	7,500
Forfeited or rescinded	(2,500)	(2,500)	(2,500)	(24,500)	(2,500)	(249,000)	(11,450)
Options Exercised		0	0	(143,000)	0	(193,000)	(165,400)
Options Outstanding at end of year	2,748,500	2,748,500	2,748,500	3,025,500	2,748,500	2,751,000	3,193,000
Options Exercisable at end of year	2,323,400	2,327,400	2,329,400	2,265,400	2,506,700	2,323,900	2,091,900
Weighted Average Exercise Price, Outstanding at beginning of the year	$ 6.28	$ 6.28	$ 6.28	$ 6.07	$ 6.28	$ 6.07	$ 5.90
Weighted Average Exercise Price, Issued	0	0	0	0	0	0	11.70
Weighted Average Exercise Price, Forfeited or rescinded	11.70	11.70	11.70	11.39	11.70	6.09	10.12
Weighted Average Exercise Price, Exercised	0	0	0	3.29	0	2.96	2.63
Weighted Average Exercise Price, Outstanding at end of year	6.28	6.28	6.28	6.15	6.28	6.28	6.07
Weighted Average Exercise Price, Exercisable at end of year	$ 5.42	$ 5.42	$ 5.43	$ 4.92	5.78	5.42	4.85
Options Outstanding - Weighted-Average Remaining Contractual Life (in years)	5 years 3 months 18 days	4 years 6 months	4 years 2 months 12 days	5 years 3 months 18 days
Options Exercisable - Weighted-Average Remaining Contractual Life (in years)	4 years 7 months 6 days	4 years	3 years 8 months 12 days	4 years 7 months 6 days
Weighted average fair value of options granted during the year					$ 0	$ 0	$ 9.14

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The number of shares into which fully or partially vested stock options outstanding as of the balance sheet date can be currently converted under the option plan.

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The weighted-average price as of the balance sheet date at which grantees can acquire the shares reserved for issuance on vested portions of options outstanding and currently exercisable under the stock option plan.

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The number of shares under options that were cancelled during the reporting period as a result of occurrence of a terminating event specified in contractual agreements pertaining to the stock option plan.

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Gross number of share options (or share units) granted during the period.

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Number of options outstanding, including both vested and non-vested options.

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Weighted average price at which grantees can acquire the shares reserved for issuance under the stock option plan.

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Weighted average per share amount at which grantees can acquire shares of common stock by exercise of options.

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Weighted average remaining contractual term for vested portions of options outstanding and currently exercisable or convertible, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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