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Note 7 - Employee Retirement Benefit Plans (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Apr. 21, 2015
Pension Plan Settlement Agreement, Amount Payable     $ 10,500
Pension Plan Settlement Agreement, Payment Schedule with $1,500 due within ten days following the effective date of the Pension Settlement Agreement and the remainder paid in twelve annual installments of $750 beginning on October 31, 2015    
Pension Plan Settlement Agreement, Stock Payable     88,117
Settled ERISA Liabilities     $ 46,000
Line of Credit Facility, Maximum Borrowing Capacity $ 1,100    
Pension Cost (Reversal of Cost) 217 $ 231  
Decrease (increase) in minimum pension liability $ 200 $ (30)  
Assumptions Used Calculating Benefit Obligation, Discount Rate 3.80% 3.10%  
Assumptions Used Calculating Net Periodic Benefit Cost, Discount Rate 3.80% 3.10%  
Second Intercreditor Agreement      
Line of Credit Facility, Maximum Borrowing Capacity $ 3,000    
Intercreditor Agreement      
Line of Credit Facility, Maximum Borrowing Capacity 6,500    
401K Deferred Savings Plan      
Contribution by Employer $ 444 $ 451