Note 3 - Fair Value (Details Textual) xbrli-pure in Thousands	3 Months Ended
	Jun. 30, 2017 USD ($)	Dec. 31, 2016 USD ($)	Jun. 30, 2016 USD ($)	Mar. 31, 2017 USD ($)
Other than Temporary Impairment Losses, Investments	$ 0		$ 151,000
Derivative, Number of Instruments Held	0			0
Debt, Long-term and Short-term, Combined Amount	$ 78,000,000			$ 77,800,000
Impairment of Intangible Assets, Finite-lived		$ 1,400,000
Fair Value, Inputs, Level 3 [Member]
Assets, Fair Value Disclosure, Recurring	0			0
Liabilities, Fair Value Disclosure, Recurring	$ 0			$ 0