Note 2 - Other Assets (Details Textual) - USD ($)	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015	Dec. 31, 2015
Depreciation and Amortization [Member] | Computer Software, Intangible Asset [Member]
Amortization of Intangible Assets	$ 900,000	$ 800,000	$ 2,500,000	$ 2,500,000
Computer Software, Intangible Asset [Member]
Finite-Lived Intangible Asset, Useful Life			15 years
Other Assets [Member]
Capitalized Computer Software, Net	33,800,000		$ 33,800,000
Indefinite-Lived Franchise Rights	7,000,000		7,000,000		$ 7,900,000
Finite-Lived Intangible Assets, Amortization Expense, Year Two	3,400,000		3,400,000
Finite-Lived Intangible Assets, Amortization Expense, Year Three	3,400,000		3,400,000
Finite-Lived Intangible Assets, Amortization Expense, Year Four	3,400,000		3,400,000
Finite-Lived Intangible Assets, Amortization Expense, Year Five	3,400,000		3,400,000
Goodwill and Intangible Asset Impairment	0	$ 0	0	$ 0	$ 0
Capitalized Computer Software, Accumulated Amortization	16,000,000		16,000,000
Finite-Lived Intangible Assets, Amortization Expense, Next Twelve Months	$ 3,400,000		$ 3,400,000