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Note 1 - Summary of Significant Accounting Policies (Details Textual) - USD ($) shares in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Jan. 01, 2019	Jan. 01, 2018
Cash Equivalents, at Carrying Value, Total	$ 0
Cash, Uninsured Amount	3,800,000
Business Acquisition, Goodwill, Expected Tax Deductible Amount	$ 47,900,000
Treasury Stock, Shares, Acquired	0	0
Contract with Customer, Liability, Current	$ 2,507,000	$ 297,000			$ 871,000
Increase (Decrease) in Contract with Customer, Liability	35,000	91,000	$ 206,000
Increase (Decrease) in Accrued Liabilities, Total	1,472,000	974,000	(567,000)
Accrued Liabilities, Current, Total	8,458,000	5,466,000
Reclassification of Deferred Revenue [Member] | Scenario, Adjustment [Member]
Contract with Customer, Liability, Current		297,000
Increase (Decrease) in Contract with Customer, Liability	91,000
Increase (Decrease) in Accrued Liabilities, Total	(206,000)
Accrued Liabilities, Current, Total		(297,000)
Accounting Standards Update 2016-02 [Member] | Subsequent Event [Member]
Operating Lease, Right-of-Use Asset				$ 4,000,000
Operating Lease, Liability, Total				$ 4,100,000
Employee Stock Option [Member]
Employee Service Share-based Compensation, Tax Benefit from Compensation Expense	$ 544,000	$ 525,000	$ 318,000
Minimum [Member]
Finite-Lived Intangible Asset, Useful Life	5 years
Maximum [Member]
Finite-Lived Intangible Asset, Useful Life	20 years

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