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Current and Long-Term Financing (Debt Schedule) (Details) - USD ($)
$ in Thousands
Dec. 31, 2019
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Debt Instrument [Line Items]                
Total debt outstanding $ 58,497       $ 46,624      
Revolving credit agreements 35,000 $ 30,000 $ 30,000 $ 30,000 35,000 $ 30,000 $ 30,000 $ 20,000
HBB                
Debt Instrument [Line Items]                
Total outstanding borrowings 58,305       45,733      
Other debt 192       891      
Current portion of borrowings outstanding 23,497       11,624      
Revolving credit agreements 35,000       35,000      
Current portion and long-term portion of borrowings outstanding 58,497       46,624      
Total available borrowings, net of limitations, under revolving credit agreements 114,366       114,669      
Unused revolving credit agreements $ 56,061       $ 68,936      
Weighted average stated interest rate on total borrowings 4.16%       4.12%      
Weighted average effective interest rate on total borrowings (including interest rate swap agreements) 3.82%       3.45%