Discontinued Operations (Schedule of Financial Results of Discontinued Operations) (Details) - USD ($)  | 
3 Months Ended | 12 Months Ended | ||||||||
|---|---|---|---|---|---|---|---|---|---|---|
Dec. 31, 2020  | 
Sep. 30, 2020  | 
Jun. 30, 2020  | 
Mar. 31, 2020  | 
Dec. 31, 2019  | 
Sep. 30, 2019  | 
Jun. 30, 2019  | 
Mar. 31, 2019  | 
Dec. 31, 2020  | 
Dec. 31, 2019  | 
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| Discontinued Operations [Abstract] | ||||||||||
| Sales | $ 3,024,000 | $ 18,879,000 | ||||||||
| Cost of sales | 2,167,000 | 12,965,000 | ||||||||
| Selling, general and administrative expenses | 520,000 | 2,684,000 | ||||||||
| Restructuring expenses | 960,000 | |||||||||
| Gain on sale of assets | (2,247,000) | (2,990,000) | ||||||||
| Operating income before income taxes | 1,624,000 | 6,220,000 | ||||||||
| Income tax expense | 2,000 | |||||||||
| Income (loss) from discontinued operations | $ 171,000 | $ (291,000) | $ (569,000) | $ 2,313,000 | $ 506,000 | $ 860,000 | $ 3,842,000 | $ 1,010,000 | $ 1,624,016 | $ 6,218,430 | 
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- Definition Disposal Group, Including Discontinued Operation, Restructuring Expenses No definition available. 
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- Definition Amount before tax of gain (loss) not previously recognized resulting from the disposal of a discontinued operation. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef 
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- Definition Amount before tax of income (loss) from a discontinued operation. Includes, but is not limited to, the income (loss) from operations during the phase-out period, gain (loss) on disposal, gain (loss) for reversal of write-down (write-down) to fair value, less cost to sell, and adjustments to a prior period gain (loss) on disposal. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef 
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- Definition Amount of tax expense (benefit) related to a discontinued operation. Includes, but is not limited to, tax expense (benefit) related to income (loss) from operations during the phase-out period, tax expense (benefit) related to gain (loss) on disposal, tax expense (benefit) related to gain (loss) for reversal of write-down (write-down) to fair value, less cost to sell, and tax expense (benefit) related to adjustments of a prior period gain (loss) on disposal. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef 
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- References No definition available. 
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- Definition Amount of costs of goods sold attributable to disposal group, including, but not limited to, discontinued operation. Reference 1: http://www.xbrl.org/2003/role/disclosureRef 
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- Definition Amount of general and administrative expense attributable to disposal group, including, but not limited to, discontinued operation. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef 
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- Definition Amount of revenue attributable to disposal group, including, but not limited to, discontinued operation. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef 
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- Definition Amount after tax of income (loss) from a discontinued operation including the portion attributable to the noncontrolling interest. Includes, but is not limited to, the income (loss) from operations during the phase-out period, gain (loss) on disposal, gain (loss) for reversal of write-down (write-down) to fair value, less cost to sell, and adjustments to a prior period gain (loss) on disposal. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef 
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