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Note 1 - Significant Accounting Policies - Fair Value of the Company's Investments by Type (Details) - USD ($) $ in Thousands	Jun. 30, 2017	Dec. 31, 2016
Amortized Cost	$ 50,446	$ 41,407
Accrued Interest	149	77
Gross Unrealized Gains	10	11
Gross Unrealized Losses	(25)	(23)
Estimated Fair Value	50,580	41,472
US Government Agencies Debt Securities [Member]
Amortized Cost	26,436	20,266
Accrued Interest	85	34
Gross Unrealized Gains		2
Gross Unrealized Losses	(11)	(4)
Estimated Fair Value	26,510	20,298
Corporate Debt Securities [Member]
Amortized Cost	9,248	6,179
Accrued Interest	42	26
Gross Unrealized Gains	1	2
Gross Unrealized Losses	(8)	(8)
Estimated Fair Value	9,283	6,199
Certificates of Deposit [Member]
Amortized Cost	14,762	14,962
Accrued Interest	22	17
Gross Unrealized Gains	9	7
Gross Unrealized Losses	(6)	(11)
Estimated Fair Value	$ 14,787	$ 14,975

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Amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading.

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-Publisher FASB
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Amount before tax of unrealized loss in accumulated other comprehensive income (AOCI) on investments in debt and equity securities classified as available-for-sale.

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