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Share-Based Compensation (Narrative) (Details) - USD ($) $ / shares in Units, $ in Thousands	1 Months Ended	6 Months Ended	12 Months Ended
	Jun. 30, 2015	Jun. 30, 2017	Dec. 31, 2018	Dec. 31, 2017	Jun. 30, 2018	Dec. 31, 2016	Jun. 30, 2016	Jun. 30, 2013	Jun. 30, 2010	Jun. 30, 2007
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation expense			$ 702	$ 742
Total unrecognized compensation costs			$ 1,000
Weighted average recognition period			2 years 3 months 18 days
Restricted Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares restricted stock forfeited			70,000
Stock Options [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock options outstanding			591,000	713,000		684,000
Weighted-average grant-date fair value of stock options granted			$ 1.84	$ 1.87
Fair value of stock options vested			$ 200	$ 200
Net settlement exercises shares issued			0	20,000
Net settlement exercises shares cancelled				80,000
Intrinsic value of stock option exercises, total			$ 100	$ 100
Stock Options [Member] \| January 2018 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Percentage of vested stock awards granted		20.00%
Stock Options [Member] \| One Year Anniversary Of Offering [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Percentage of vested stock awards granted		10.00%
Stock Options [Member] \| Evenly Over Four Years [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Percentage of vested stock awards granted		40.00%
2007 Stock Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares available for grant			0	0
Shares issued and outstanding			500,000	700,000
2016 Stock Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares available for grant			400,000	100,000
Shares issued and outstanding			400,000	600,000
2016 Stock Plan [Member] \| Initial [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period				3 years
Employee Stock Purchase Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares authorized			550,000
Maximum employee subscription rate			15.00%
Maximum value of shares per employee			$ 25
Maximum number of shares per employee			10,000
Purchase price of stock			85.00%
Shares available for purchase under ESPP			50,000
Discount on the purchase price of stock option				15.00%
Employee stock purchase plan compensation expense			$ 0	$ 0
Maximum [Member] \| Stock Options [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Cash received from exercise of stock options			$ 100	$ 100
Maximum [Member] \| 2007 Stock Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Option expiration period	10 years
Number of shares authorized	2,000,000							1,500,000	1,250,000	1,000,000
Maximum [Member] \| 2016 Stock Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Option expiration period				10 years
Number of shares authorized					850,000		250,000
Employees [Member] \| 2007 Stock Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period	4 years
Employees [Member] \| 2016 Stock Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period				4 years
Directors [Member] \| 2007 Stock Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period	1 year
Directors [Member] \| 2016 Stock Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period				1 year
Senior Management [Member] \| Restricted Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vested period for stock awards granted				4 years
Stock option awarded				600,000
Board Members [Member] \| Restricted Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vested period for stock awards granted				1 year
Board Members And Senior Management [Member] \| Restricted Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period				4 years
Restricted stock granted in period				200,000
Number of shares restricted stock vested			180,000	10,000
Number of shares restricted stock forfeited				30,000
Restricted stock-based compensation expense			$ 500	$ 600
Evolving Systems U.K. [Member] \| Maximum [Member] \| Stock Options [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Deferred income tax benefits from stock option expense			$ 100	$ 100