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Note 17 - Subsequent Events (Details Textual)	May 14, 2020 shares	May 12, 2020 shares	May 06, 2020 USD ($) $ / shares shares	Apr. 20, 2020 USD ($)	Apr. 02, 2020 shares	Mar. 12, 2020 $ / shares	Feb. 14, 2020 $ / shares	Nov. 11, 2015 $ / shares
Share Price (in dollars per share) | $ / shares						$ 0.76
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) | $ / shares							$ 0.65	$ 3.60
Subsequent Event [Member]
Proceeds from Paycheck Protection Program Under CARES Act | $				$ 340,000
Subsequent Event [Member] | Warrants Issued in Connection with Senior Secured Convertible Note [Member]
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares) | shares			1,900,000
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) | $ / shares			$ 1.16
Subsequent Event [Member] | Warrants Issued in Connection with Senior Secured Convertible Note [Member] | Maxim [Member]
Class of Warrant or Right, Percentage of Placement Fee from Gross Proceeds from Issuance of Warrants			7.00%
Subsequent Event [Member] | Warrants Issued to Investor for Business Referral [Member]
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares) | shares		125,000
Subsequent Event [Member] | Senior Secured Convertible Note [Member]
Debt Instrument, Face Amount | $			$ 2,415,000
Short-term Debt, Total | $			$ 2,100,000
Debt Instrument, Number of Monthly Periodic Payments			5
Debt Instrument, Periodic Payment, Principal | $			$ 268,333
Debt Instrument, Convertible, Conversion Price (in dollars per share) | $ / shares			$ 1.16
Debt Instrument, Fee Amount | $			$ 133,333
Stock Issued During Period, Shares, Due Diligence Fees (in shares) | shares			114,943
Share Price (in dollars per share) | $ / shares			$ 1.16
Directors [Member] | Subsequent Event [Member]
Stock Issued During Period, Shares, Issued for Services (in shares) | shares	1,632	7,077			6,850
A New Employee [Member] | Subsequent Event [Member]
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares) | shares					5,000
Class of Warrant or Right, Vesting Period (Year)					3 years

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-Topic 505
-SubTopic 10
-Section 50
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