Note 2 - Summary of Significant Accounting Policies (Details Textual)	3 Months Ended	6 Months Ended
Jun. 30, 2018 USD ($)	Mar. 31, 2018 USD ($)	Jun. 30, 2018 USD ($)	Jan. 01, 2018 USD ($)
Maximum Period Of Agreement			21 years
Contract with Customer, Liability, Revenue Recognized		$ 207,000	$ 269,000
Contract with Customer, Liability, Current	$ 718,000	$ 384,000	$ 718,000
Goodwill, Impairment Loss	12,695,000
Impairment of Intangible Assets (Excluding Goodwill), Total	$ 14,507,000
Number of Reportable Segments			2
Retained Earnings [Member] \| Accounting Standards Update 2014-09 [Member]
Cumulative Effect of New Accounting Principle in Period of Adoption				$ (79,000)

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Amount after tax of increase (decrease) to equity or (increase) decrease to net assets, resulting from the cumulative effect adjustment of a new accounting principle applied in the period of adoption.

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The amount of impairment loss recognized in the period resulting from the write-down of the carrying amount of an intangible asset (excluding goodwill) to fair value.

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