INCOME TAXES (Narrative) (Details) - USD ($)	3 Months Ended												12 Months Ended
	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Tax at federal statutory rate														35.00%	35.00%	34.00%
Income (loss) before taxes	$ 5,531,000	$ 5,686,000	$ 3,906,000	$ 4,662,000	$ 4,377,000	$ 3,843,000	$ 3,684,000	$ 3,995,000	$ 3,506,000	$ 3,109,000	$ 2,631,000	$ 2,270,000		$ 19,785,000	$ 15,899,000	$ 11,516,000
Operating loss carryforwards, state	$ 12,100,000													$ 12,100,000
AMT carryover					$ 869,000										869,000
Accumulated Foreign Subsidiary Earnings Not Previously Subject To Us Income, Foreign Cash And Certain Other Net Current Assets, Tax Rate														15.50%
Accumulated Foreign Subsidiary Earnings Not Previously Subject To Us Income, Remaining Earnings, Tax Rate														8.00%
Provisional Amount For One Time Transitional Tax Liability And Income Tax Expense														$ 100,100
Net Tax Expense Recognized, Related To The Tax Act														582,000
Scenario, Plan [Member]
Tax at federal statutory rate													21.00%
Parent Company [Member]
Income (loss) before taxes														$ 600,000	$ 1,060,000	$ 859,000