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Note 2 - Summary of Significant Accounting Policies (Details Textual) - USD ($)		12 Months Ended
	Feb. 07, 2020	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Cash, Cash Equivalents, and Short-term Investments, Total		$ 1,600,000
Restricted Cash and Cash Equivalents, Total		500,000
Cash and Cash Equivalents, at Carrying Value, Ending Balance		1,126,124	$ 3,617,234	$ 4,230,548
Cash Equivalents, at Carrying Value, Total		1,100,000	3,600,000
Short-term Investments, Total		452,301	503,810
Cash and Cash Equivalents, Period Increase (Decrease), Total		(2,491,110)	(613,314)
Accounts Receivable, Allowance for Credit Loss, Current		$ 0	$ 200,000
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross		0	0
Income Tax Expense (Benefit), Total		$ 0	$ 0	$ 0
The Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized			597,557
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant		461,452
Common Stock, Capital Shares Reserved for Future Issuance		136,105
Share-based Compensation Arrangement by Share-based Payment Award, Maximum Number of Shares Per Employee		100,000
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period		10 years
The ESPP [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant		525,000
Percentage of Common Stock Outstanding of Preceding Year		10.00%
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Limited Per Year		$ 100,000
Share-based Compensation Arrangement by Share-based Payment Award, Maximum Employee Subscription Rate		15.00%
Share-based Compensation Arrangement by Share-based Payment Award, Discount from Market Price, Offering Date		85.00%
Subsequent Event [Member]
Dollar:Russian Ruble Exchange Rate	6368.52%
Cash and Cash Equivalents, Period Increase (Decrease), Total	$ (0.005)
Certificates of Deposit [Member]
Short-term Investments, Total			$ 500,000
RUSSIAN FEDERATION
Cash and Cash Equivalents, at Carrying Value, Ending Balance		$ 150,000
Cash and Cash Equivalent, Denominated in Rubles		120,000
Cash and Cash Equivalent, Denominated in U.S. Dollars		$ 30,000
Non-US [Member] \| Geographic Concentration Risk [Member] \| Cash and Cash Equivalents [Member]
Concentration Risk, Percentage		14.00%