Income Taxes, Uncertain Tax Liabilities (Details) - USD ($)	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Income Taxes [Abstract]
Unrecognized tax benefits decrease due to accounting method change	$ 133,907
Uncertain Tax Liabilities, Total [Roll Forward]
Beginning balance	1,825,000
Ending balance	2,215,000	$ 1,825,000
Federal [Member]
Tax [Roll Forward]
Beginning balance	833,000	0
Increases	163,000	833,000
Decreases	0	0
Ending balance	996,000	833,000
Interest and Penalties [Roll Forward]
Beginning balance	0	0
Increases	4,000	0
Decreases	0	0
Ending balance	4,000	0
Foreign Tax Authority [Member]
Uncertain Tax Liabilities, Total [Roll Forward]
Beginning balance		665,000
Increases	420,000	1,160,000
Decreases	30,000	0
Foreign Tax Authority [Member] | China [Member]
Tax [Roll Forward]
Beginning balance	216,000	202,000
Increases	0	14,000
Decreases	12,000	0
Ending balance	204,000	216,000
Interest and Penalties [Roll Forward]
Beginning balance	262,000	209,000
Increases	23,000	53,000
Decreases	0	0
Ending balance	285,000	262,000
Foreign Tax Authority [Member] | Ukraine [Member]
Tax [Roll Forward]
Beginning balance	100,000	89,000
Increases	0	11,000
Decreases	18,000	0
Ending balance	82,000	100,000
Interest and Penalties [Roll Forward]
Beginning balance	28,000	28,000
Increases	44,000	0
Decreases	0	0
Ending balance	72,000	28,000
Foreign Tax Authority [Member] | South Korea [Member]
Tax [Roll Forward]
Beginning balance	341,000	129,000
Increases	120,000	212,000
Decreases	0	0
Ending balance	461,000	341,000
Interest and Penalties [Roll Forward]
Beginning balance	45,000	8,000
Increases	66,000	37,000
Decreases	0	0
Ending balance	$ 111,000	$ 45,000