Note 5 - Other Accounts Receivable - Schedule of Other Accounts Receivable (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Other Receivables	$ 1,899	$ 1,875
Carrier Access Bills Receivable [Member]
Other Receivables	277	282
NECA Receivable [Member]
Other Receivables	1,295	1,238
Receivables from Alabama Service Fund [Member]
Other Receivables	53	53
Other Miscellaneous [Member]
Other Receivables	$ 274	$ 302