Note 14 - Income Taxes (Details Textual) - USD ($)	3 Months Ended	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent		21.00%	35.00%	35.00%
Income Tax Expense (Benefit), Continuing Operations, Adjustment of Deferred Tax (Asset) Liability	$ 10,000,000		$ 10,000,000
Deferred Tax Assets, Valuation Allowance, Total	8,170,000	$ 7,598,000	8,170,000
Valuation Allowance, Deferred Tax Asset, Increase (Decrease), Amount		(600,000)
Liability for Uncertainty in Income Taxes, Current	500,000	10,400,000	500,000
Unrecognized Tax Benefits that Would Impact Effective Tax Rate	$ 500,000	3,500,000	500,000
Unrecognized Tax Benefits, Income Tax Penalties and Interest Expense, Total		1,900,000	$ 0	$ 300,000
Minimum [Member]
Decrease in Unrecognized Tax Benefits is Reasonably Possible		0
Maximum [Member]
Decrease in Unrecognized Tax Benefits is Reasonably Possible		3,000,000
State and Local Jurisdiction [Member]
Operating Loss Carryforwards, Total		$ 18,000,000
Open Tax Year		2014 2015 2016 2017 2018
Domestic Tax Authority [Member] | Internal Revenue Service (IRS) [Member]
Open Tax Year		2015 2016 2017 2018