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Note 12 - Stockholders' Equity (Details Textual)						12 Months Ended
	Oct. 23, 2019 shares	Nov. 27, 2018 shares	Oct. 05, 2017	Oct. 02, 2017 shares	Jun. 12, 2015 shares	Dec. 31, 2019 USD ($) $ / shares shares	Dec. 31, 2018 USD ($) $ / shares shares	Jun. 13, 2016 shares
Increase (Decrease) in Common Stock Shares Authorized				(300,000,000)	100,000,000
Common Stock, Shares Authorized				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						314,218	234,218
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross							0
Share-based Payment Arrangement, Expense | $						$ 2,050,862	$ 142,017
Share-based Payment Arrangement, Option [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number, Ending Balance						154,005	74,004
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price, Ending Balance | $ / shares						$ 10.73	$ 15.52
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Remaining Contractual Term						8 years 29 days	7 years 281 days
Plan 2013 [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Number of Additional Shares Authorized	177,000	178,900
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized	950,000	773,000
Share-based Compensation Arrangement by Share-based Payment Award, Share Plan Authorized, Percent of Common Stock							20.00%
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant						172,436	323,498
Plan 2013 [Member] | Board of Directors [Member]
Share-based Payment Arrangement, Expensed and Capitalized, Amount, Total | $						$ 60,000	$ 85,786
Shares Issued, Shares, Share-based Payment Arrangement, before Forfeiture						22,000
Share-based Payment Arrangement, Expense | $						$ 138,000
Plan 2013 [Member] | Executive Officer [Member]
Share-based Payment Arrangement, Expensed and Capitalized, Amount, Total | $						$ 503,000
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross						80,000
Plan 2013 [Member] | Employees and Consultants [Member]
Shares Issued, Shares, Share-based Payment Arrangement, before Forfeiture						214,507
Share-based Payment Arrangement, Expense | $						$ 1,349,000
Reverse Stock Split [Member]
Stockholders' Equity Note, Stock Split, Conversion Ratio			10

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