Note 16 - Income Taxes - Significant Components of Company's Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Net operating loss carry forwards	$ 13,635	$ 16,742
Operating lease liabilities	23,374
Deferred GCI capacity revenue	8,839	9,428
Reserves and accruals	8,700	8,947
Intangibles and goodwill	855	944
Fair value on interest rate swaps	82
Pension liability	1,054	1,031
Allowance for doubtful accounts	1,314	1,118
Other	222
Total deferred tax assets	58,075	38,210
Valuation allowance	(142)	(162)
Deferred tax assets after valuation allowance	57,933	38,048
Property, plant and equipment	(37,152)	(37,320)
Operating lease right of use assets	(23,011)
Fair value on interest rate swaps		(130)
Revenue contract assets	(2,173)	(2,407)
Other		(8)
Total deferred tax liabilities	(62,336)	(39,865)
Net deferred tax liability	$ (4,403)	$ (1,817)