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Note 1 - Summary of Significant Accounting Policies (Details Textual)
3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2021
USD ($)
Mar. 31, 2021
Sep. 30, 2020
USD ($)
Sep. 30, 2021
USD ($)
Sep. 30, 2020
USD ($)
Dec. 31, 2020
USD ($)
Number of Operating Segments   1       6
Incremental Costs of Obtaining a Contract, Deferred During Period $ 233,000   $ 717,000 $ 1,800,000 $ 2,900,000  
Capitalized Contract Cost, Net, Noncurrent 4,237,000     4,237,000   $ 4,555,000
Operating Lease, Impairment Loss       324,000    
Asset Impairment Charges, Total       0 0  
Selling, General and Administrative Expenses [Member]            
Capitalized Contract Cost, Impairment Loss $ 2,000   $ 20,000 $ 24,000 $ 25,000  
Minimum [Member]            
Capitalized Contract Cost, Amortization Period (Year) 3 years     3 years    
Maximum [Member]            
Capitalized Contract Cost, Amortization Period (Year) 5 years     5 years