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Note 1 - Significant Accounting Policies - Fair Value of the Company's Investments by Type (Details) - USD ($) $ in Thousands	Jun. 30, 2020	Dec. 31, 2019
Amortized Cost	$ 15,929	$ 21,899
Accrued Interest	3	116
Gross Unrealized Gains	3	40
Gross Unrealized Losses	0	(1)
Estimated Fair Value	15,935	22,054
US Government Agencies Debt Securities [Member]
Amortized Cost	14,991	10,488
Accrued Interest	0	50
Gross Unrealized Gains	0	23
Gross Unrealized Losses	0	0
Estimated Fair Value	14,991	10,561
Certificates of Deposit [Member]
Amortized Cost	938	1,669
Accrued Interest	3	7
Gross Unrealized Gains	3	7
Gross Unrealized Losses	0	0
Estimated Fair Value	$ 944	1,683
Corporate Debt Securities [Member]
Amortized Cost		9,742
Accrued Interest		59
Gross Unrealized Gains		10
Gross Unrealized Losses		(1)
Estimated Fair Value		$ 9,810

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