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Note 1 - Significant Accounting Policies and Concentrations of Risk - Fair Value of the Company's Investments by Type (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Amortized Cost	$ 99,965	$ 105,241
Accrued Interest	444	412
Gross Unrealized Gains	19	1
Gross Unrealized Losses	(316)	(244)
Estimated Fair Value	100,112	105,410
US Government Agencies Debt Securities [Member]
Amortized Cost	50,613	60,121
Accrued Interest	176	177
Gross Unrealized Gains	15
Gross Unrealized Losses	(131)	(122)
Estimated Fair Value	50,673	60,176
Corporate Debt Securities [Member]
Amortized Cost	45,793	34,021
Accrued Interest	254	203
Gross Unrealized Gains	4
Gross Unrealized Losses	(171)	(108)
Estimated Fair Value	45,880	34,116
Certificates of Deposit [Member]
Amortized Cost	3,559	11,099
Accrued Interest	14	32
Gross Unrealized Gains		1
Gross Unrealized Losses	(14)	(14)
Estimated Fair Value	$ 3,559	$ 11,118

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