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Debt (Details) - USD ($)
6 Months Ended 12 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Dec. 31, 2019
Apr. 24, 2020
Dec. 31, 2017
Debt Instrument [Line Items]          
Loans Payable $ 36,000,000   $ 38,250,000    
Unamortized Loan Commitment and Origination Fees and Unamortized Discounts or Premiums (672,000)   (807,000)    
Debt, Current, Net (35,360,000)   49,451,000    
Revolving Line of Credit 0   12,008,000    
Other Loans Payable     0    
Purchase Price Funded with Debt 49,500,000        
Less current portion (36,167,000)   (50,258,000)    
Working Capital $ 12,345,000        
Long-term Debt, Gross     $ 0    
Derivative, Fixed Interest Rate 2.49%        
Percent of subsidiary stock not security for financing 65.00%        
Letter of Credit, Maximum $ 250,000        
Letters of Credit Outstanding, Amount 160,000        
Term Loan Domestic [Member]          
Debt Instrument [Line Items]          
Debt Instrument, Face Amount 32,000,000        
Domestic Line of Credit [Member]          
Debt Instrument [Line Items]          
Revolving Line of Credit 2,000,000        
Maximum borrowing capacity 40,000,000        
Term Loan Foreign [Member]          
Debt Instrument [Line Items]          
Debt Instrument, Face Amount $ 13,000,000        
Revolving Credit Facility [Member]          
Debt Instrument [Line Items]          
Debt Instrument, Interest Rate, Stated Percentage 8.00%   6.04%    
Debt Instrument, Basis Spread on Variable Rate 2.00%        
Foreign Line of Credit [Member]          
Debt Instrument [Line Items]          
Revolving Line of Credit $ 2,500,000        
Existing Term Loan [Member]          
Debt Instrument [Line Items]          
Loans Payable         $ 6,750,000
Equipment Term Loan [Member]          
Debt Instrument [Line Items]          
Other Loans Payable 167,000     $ 175,000  
Long-term Debt, Gross $ 135,000        
Debt Instrument, Interest Rate, Stated Percentage 5.50%   0.00%    
Derivative, Basis Spread on Variable Rate 55000.00%        
Line of Credit [Member] | Foreign Line of Credit [Member]          
Debt Instrument [Line Items]          
Maximum borrowing capacity $ 10,000,000        
First Amendment [Member] | Domestic Line of Credit [Member]          
Debt Instrument [Line Items]          
Maximum borrowing capacity $ 32,500,000        
First Amendment [Member] | Domestic Line of Credit Additional Amount [Member]          
Debt Instrument [Line Items]          
Derivative, Basis Spread on Variable Rate 70000.00%        
Forbearance Agreement [Member] | Domestic Line of Credit [Member]          
Debt Instrument [Line Items]          
Maximum borrowing capacity $ 28,000,000        
Amended Forbearance Agreement [Member] | Unblocked Domestic Line of Credit [Member]          
Debt Instrument [Line Items]          
Maximum borrowing capacity 20,000,000        
Amended Forbearance Agreement [Member] | Domestic Line of Credit [Member]          
Debt Instrument [Line Items]          
Maximum borrowing capacity 25,000,000        
Amended Forbearance Agreement [Member] | Domestic Line of Credit Additional Amount [Member]          
Debt Instrument [Line Items]          
Maximum borrowing capacity $ 5,000,000        
Derivative, Basis Spread on Variable Rate 6.50%        
Interest Rate Swap Domestic [Member]          
Debt Instrument [Line Items]          
Debt Instrument, Face Amount $ 25,000,000        
Interest Rate Swap Foreign [Member]          
Debt Instrument [Line Items]          
Debt Instrument, Face Amount 10,000,000        
Interest Rate Swap [Member]          
Debt Instrument [Line Items]          
Debt Instrument, Face Amount $ 35,000,000        
Term Loan [Member]          
Debt Instrument [Line Items]          
Debt Instrument, Interest Rate, Stated Percentage 8.00%   6.30%    
Maximum [Member]          
Debt Instrument [Line Items]          
Debt Instrument, Restrictive Covenants 3500000 7500000 12500000    
Liability [Member] | Interest Rate Swap [Member]          
Debt Instrument [Line Items]          
Foreign Currency Contracts, Liability, Fair Value Disclosure $ 1,428,000   $ 706,000