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Stock-Based Compensation (Narrative) (Details)	3 Months Ended
Stock-Based Compensation (Narrative) (Details)	Sep. 30, 2020 USD ($) shares	Dec. 31, 2019 Target	Sep. 30, 2019 USD ($) shares	Dec. 31, 2018 Target
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Proceeds from stock plans	$ 0		$ 0
Interim President and Chief Executive Officer [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock based compensation expense	$ 33,000
Board Of Directors [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares issued to directors \| shares	11,913
Shares issued to directors, value	$ 51,000
Employee Stock Option [Member] \| 2004 Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock based compensation expense	22,000		$ 56,000
Unrecognized compensation cost	$ 29,000
Expected weighted average vesting period to recognize compensation	1 year 10 months 24 days
Options issued \| shares	0		0
Employee Stock Option [Member] \| Minimum [Member] \| 2004 Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expiration period	10 years
Employee Stock Option [Member] \| Minimum [Member] \| Tranche 1 Through 4 [Member] \| 2004 Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting rate	25.00%
Employee Stock Option [Member] \| Maximum [Member] \| 2004 Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Period before vesting begins	1 year
Employee Stock Option [Member] \| Maximum [Member] \| Tranche 1 Through 3 [Member] \| 2004 Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting rate	33.30%
Restricted Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock based compensation expense	$ 18,000		$ 65,000
Expected weighted average vesting period to recognize compensation	1 year
Total unrecognized compensation related to restricted stock awards	$ 33,000
Operating Income-Based Performance Shares [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of performance targets \| Target		2		2
Operating Income-Based Performance Shares [Member] \| Minimum [Member] \| Tranche 1 Through 3 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting rate		75.00%		75.00%
Operating Income-Based Performance Shares [Member] \| Maximum [Member] \| Tranche 1 Through 3 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting rate		200.00%		200.00%
Revenue-Based Performance Shares [Member] \| Minimum [Member] \| Tranche 1 Through 3 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting rate		50.00%		50.00%
Revenue-Based Performance Shares [Member] \| Maximum [Member] \| Tranche 1 Through 3 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting rate		150.00%		150.00%
Performance Shares [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock based compensation expense	$ 0		$ 51,000
Expected weighted average vesting period to recognize compensation	1 year 1 month 6 days
Total unrecognized compensation related to restricted stock awards	$ 125,000
Performance Shares [Member] \| Maximum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting rate		75.00%		75.00%