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Note 11 - Stockholders' Equity (Details Textual)						3 Months Ended		12 Months Ended
	Oct. 23, 2019 shares	Nov. 27, 2018 shares	Oct. 05, 2017	Oct. 02, 2017 shares	Jun. 12, 2015 shares	Mar. 31, 2020 USD ($) $ / shares shares	Mar. 31, 2019 USD ($)	Dec. 31, 2019 $ / shares shares	Jun. 13, 2016 shares
Increase (Decrease) in Common Stock Shares Authorized (in shares)				(300,000,000)	100,000,000
Common Stock, Shares Authorized (in shares)				100,000,000	300,000,000	100,000,000		100,000,000	400,000,000
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number, Ending Balance (in shares)						314,218		314,218
Share-based Payment Arrangement, Option [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number, Ending Balance (in shares)						154,005		154,005
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price, Ending Balance (in dollars per share) | $ / shares						$ 10.73		$ 10.73
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Remaining Contractual Term (Year)						7 years 302 days		8 years 29 days
Plan 2013 [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Number of Additional Shares Authorized (in shares)	177,000	178,900
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized (in shares)	950,000	773,000
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant (in shares)						237,764		252,436
Plan 2013 [Member] | Board of Directors [Member]
Share-based Payment Arrangement, Expensed and Capitalized, Amount, Total | $						$ 7,500	$ 15,006
Reverse Stock Split [Member]
Stockholders' Equity Note, Stock Split, Conversion Ratio			10

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Weighted average price at which grantees can acquire the shares reserved for issuance under the stock option plan.

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Ratio applied to the conversion of stock split, for example but not limited to, one share converted to two or two shares converted to one.

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