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Note 14 - Retirement Plans - Additional Information About AEPF Multi-employer Pension Plan (Details) - Alaska Electrical Pension Plan [Member]
12 Months Ended
Dec. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Employer Identification Number 92-6005171  
Pension plan number 1  
December 31 Green Green
Plan subject to funding improvement plan and rehabilitation plan No  
Employer subject to contribution surcharge No  
Special Agreement [Member]    
December 31, 2019 $ 6,588 $ 6,492
December 31, 2019 Yes Yes
December 31, 2018 Yes Yes
Collective Bargaining Agreement [Member]    
Collective Bargaining Agreement Between Alaska Communications Systems and Local Union 1547 IBEW Dec. 31, 2023  
Outside Agreement [Member]    
Collective Bargaining Agreement Between Alaska Communications Systems and Local Union 1547 IBEW Jun. 30, 2022  
Inside Agreement [Member]    
Collective Bargaining Agreement Between Alaska Communications Systems and Local Union 1547 IBEW Oct. 31, 2022