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Note 1 - Significant Accounting Policies - Fair Value of the Company's Investments by Type (Details) - USD ($) $ in Thousands	Mar. 31, 2020	Dec. 31, 2019
Amortized Cost	$ 11,068	$ 21,899
Accrued Interest	103	116
Gross Unrealized Gains	15	40
Gross Unrealized Losses	(1)	(1)
Estimated Fair Value	11,185	22,054
US Government Agencies Debt Securities [Member]
Amortized Cost	4,501	10,488
Accrued Interest	44	50
Gross Unrealized Gains	8	23
Gross Unrealized Losses
Estimated Fair Value	4,553	10,561
Corporate Debt Securities [Member]
Amortized Cost	5,387	9,742
Accrued Interest	52	59
Gross Unrealized Gains	2	10
Gross Unrealized Losses	(1)	(1)
Estimated Fair Value	5,440	9,810
Certificates of Deposit [Member]
Amortized Cost	1,180	1,669
Accrued Interest	7	7
Gross Unrealized Gains	5	7
Gross Unrealized Losses
Estimated Fair Value	$ 1,192	$ 1,683

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