Business Description And Significant Accounting Policies (Details 2) - USD ($)	3 Months Ended								12 Months Ended
	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2018	Dec. 31, 2017	Jan. 01, 2019	Jan. 01, 2018	Jan. 01, 2017	Dec. 31, 2016
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Revenues	$ 18,063,000	$ 16,683,000	$ 15,854,000	$ 14,120,000	$ 13,176,000	$ 11,828,000	$ 16,409,000	$ 11,920,000	$ 64,720,000	$ 53,333,000
Net income	1,193,000	$ 1,067,000	$ 740,000	$ (173,000)	503,000	$ (72,000)	$ 1,095,000	$ (214,000)	2,827,000	1,312,000
Retained earnings	22,264,000				19,611,000				22,264,000	19,611,000
Common stock	35,637,000				34,080,000				35,637,000	34,080,000
Deferred tax assets	5,422,000				5,742,000				5,422,000	5,742,000
Accumulated other comprehensive loss	$ (1,690,000)				$ (1,409,000)				(1,690,000)	$ (1,409,000)				$ (1,940,000)
ASU 2016-09 [Member] | Restatement Adjustment [Member] | Recognition of the deferred tax assets for previously unrecognized excess tax benefits [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Retained earnings													$ 278,000
ASU 2016-09 [Member] | Restatement Adjustment [Member] | Change in accounting for stock option forfeitures [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Retained earnings													(16,000)
Common stock													23,000
Deferred tax assets													$ 7,000
ASU 2016-01 [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Retained earnings												$ 44,000
Accumulated other comprehensive loss												44,000
ASU 2016-02 [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Right-of-use asset											$ 2,600,000
Lease liability											$ 3,200,000
Effect of adoption of Topic 606 [Member] | ASU 2014-09 [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Revenues									81,000
Net income									$ 64,000
Income per share									$ 0.01
Retained earnings												$ 218,000