Fair Value Measurements (Fair Value, Warrants Measured on Recurring Basis) (Details) - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2019	Dec. 31, 2018
Fair value of warrants at beginning of year	$ 302
Unrealized gain on fair value adjustment for warrants	429	$ 16
Fair value of warrants at end of year	731	302
Fair Value, Inputs, Level 3 [Member]
Fair value of warrants at beginning of year	302	62
Fair value of new warrants, recorded during the year (included as a discount on notes receivable)		224
Unrealized gain on fair value adjustment for warrants	429	16
Fair value of warrants at end of year	$ 731	$ 302

Fair value of the assets less the liabilities of a derivative or group of derivatives.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 50
-Paragraph 10
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The fair value of assets acquired in noncash investing or financing activities.

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
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The net change in the difference between the fair value and the carrying value, or in the comparative fair values, of derivative instruments, including options, swaps, futures, and forward contracts, held at each balance sheet date, that was included in earnings for the period.

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
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