Annual report pursuant to Section 13 and 15(d)

Long-Term Debt (Components Of Long-Term Debt) (Details)

v3.20.4
Long-Term Debt (Components Of Long-Term Debt) (Details)
12 Months Ended
Dec. 31, 2020
USD ($)
item
Dec. 31, 2019
USD ($)
Line Of Credit Facility And Long Term Debt [Line Items]    
Term note $ 18,000,000  
Total carrying amount of long-term debt 34,621,000 $ 22,670,000
Less current portion (4,000,000)  
Long-term debt, net $ 30,621,000 22,670,000
Term Note [Member]    
Line Of Credit Facility And Long Term Debt [Line Items]    
Interest rate during the year 2.0625%  
Term loan borrowings $ 20,000,000  
Frequency of payments quarterly  
Quarterly payment $ 1,000,000  
Revolving Credit Facility [Member]    
Line Of Credit Facility And Long Term Debt [Line Items]    
Credit facility 15,579,000 $ 22,670,000
Credit facility maximum borrowing capacity $ 60,000,000  
Consolidated leverage ratio | item 3.00  
Additional potential commitments $ 125,000,000  
Percentage of domestic subsidiaries securing credit agreement 100.00%  
Percentage of foreign subsidiaries securing credit agreement 65.00%  
Revolving Credit Facility, Amendment No. 2 [Member]    
Line Of Credit Facility And Long Term Debt [Line Items]    
Consolidated leverage ratio | item 4.00  
Foreign Credit Facility [Member]    
Line Of Credit Facility And Long Term Debt [Line Items]    
Credit facility $ 1,042,000  
Credit facility, Interest rate at end of period 1.3387%  
JPMorgan Chase Bank Credit Agreement [Member]    
Line Of Credit Facility And Long Term Debt [Line Items]    
Credit facility, Interest rate at end of period 2.0625% 3.3125%