Nature of Operations and Summary of Significant Accounting Policies (Trade Receivables) (Details)	12 Months Ended
Dec. 31, 2019	Dec. 31, 2018
Consolidated net accounts receivable \| Customer Concentration Risk \| Five largest customers \| HBB
Revenue, Major Customer [Line Items]
Concentration risk (percent)	69.00%	57.00%

For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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