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Note 1 - Description of Company and Summary of Significant Accounting Policies (Details Textual) - USD ($)
$ / shares in Units, shares in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Jan. 01, 2019
Jan. 08, 2018
Restricted Cash and Cash Equivalents, Current, Total $ 1,631,000 $ 1,634,000    
Equipment and Buildings Under Capital Leases, Expiration Period 2033      
Preferred Stock, Shares Authorized 5,000     145
Preferred Stock, Par or Stated Value Per Share $ 0.01      
Preferred Stock, Shares Issued, Total 0 0   0
Preferred Stock, Shares Outstanding, Ending Balance 0 0    
Advertising Expense $ 2,829,000 $ 3,074,000    
Operating Lease, Right-of-Use Asset $ 80,991,000    
Accounting Standards Update 2016-02 [Member]        
Operating Lease, Liability, Total     $ 82,020,000  
Operating Lease, Right-of-Use Asset     $ 82,020,000  
Workforce Subject to Collective Bargaining Arrangements [Member] | Unionized Employees Concentration Risk [Member] | IBEW [Member]        
Concentration Risk, Percentage 54.00%      
Revenue Benchmark [Member] | Product Concentration Risk [Member] | High Cost Support [Member]        
Concentration Risk, Percentage 9.00%      
Revenue Benchmark [Member] | Product Concentration Risk [Member] | Rural Health Care Universal Service Support [Member]        
Concentration Risk, Percentage 6.00%      
The 2017 Share Repurchase Program [Member]        
Stock Repurchase Program, Authorized Amount $ 10,000,000      
Treasury Stock, Shares, Acquired 1,000      
Treasury Stock Acquired, Average Cost Per Share $ 1.81      
Treasury Stock, Value, Acquired, Cost Method $ 1,812      
Chief Executive Officer [Member]        
Defined Benefit Plan, Cost of Providing Special and Contractual Termination Benefits 1,715,000      
Payments for Postemployment Benefits $ 1,390,000      
Minimum [Member]        
Property, Plant and Equipment, Useful Life 5 years      
Employee Stock Purchase Plan, Payroll Deduction Per Employee, Percent 1.00%      
Maximum [Member]        
Property, Plant and Equipment, Useful Life 50 years      
Employee Stock Purchase Plan, Payroll Deduction Per Employee, Percent 15.00%      
Certificates of Deposit [Member]        
Restricted Cash and Cash Equivalents, Current, Total $ 1,600,000      
Other Restricted Cash [Member]        
Restricted Cash and Cash Equivalents, Current, Total $ 31,000      
Noncontrolling Interest [Member] | Quintillion Holdings, LLC [Member]        
Variable Interest Entity, Qualitative or Quantitative Information, Ownership Percentage 50.00%      
ACS Cable Systems LLC and Quintillion Holdings, LLC Joint Venture [Member]        
Variable Interest Entity, Qualitative or Quantitative Information, Ownership Percentage 50.00%