Note 5 - Other Accounts Receivable - Schedule of Other Accounts Receivable (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Other Receivables	$ 2,373	$ 1,905
Carrier Access Bills Receivable [Member]
Other Receivables	237	235
NECA Receivable [Member]
Other Receivables	1,233	1,257
Receivables from Alabama Service Fund [Member]
Other Receivables	34	40
Other Miscellaneous [Member]
Other Receivables	$ 869	$ 373