Note 5 - Other Accounts Receivable - Schedule of Other Accounts Receivable (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Other Receivables	$ 1,905	$ 1,899
Carrier Access Bills Receivable [Member]
Other Receivables	235	277
NECA Receivable [Member]
Other Receivables	1,257	1,295
Receivables from Alabama Service Fund [Member]
Other Receivables	40	53
Other Miscellaneous [Member]
Other Receivables	$ 373	$ 274