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Note V - Subsequent Events (Details Textual)											3 Months Ended		12 Months Ended
	May 12, 2020 shares	May 06, 2020 USD ($) $ / shares shares	Apr. 20, 2020 USD ($)	Apr. 02, 2020 shares	Mar. 30, 2020 USD ($) $ / shares shares	Mar. 25, 2020 USD ($) $ / shares shares	Feb. 13, 2020 USD ($) $ / shares shares	Jan. 13, 2020 USD ($) $ / shares shares	Jun. 14, 2019 shares	Apr. 04, 2019 shares	May 14, 2020 shares	Jun. 30, 2019 shares	Dec. 31, 2019 $ / shares shares	Dec. 31, 2018 shares	Mar. 31, 2020 $ / shares	Nov. 11, 2015 $ / shares
Stock Issued During Period, Shares, Commitment Fees (in shares)									200,000	80,000		130,000
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) | $ / shares																$ 3.60
Total Warrants Exercised (in shares)
Share Price (in dollars per share) | $ / shares													$ 0.50
Forecast [Member]
Sales Incentive Fee, for Each 5,000,000 Revenue Not to Exceed 20,000,000 Revenue | $						$ 500,000
Sales Incentive Fee Payable in Shares, for Each 5,000,000 Revenue Not to Exceed 20,000,000 Revenue (in shares)						500,000
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) | $ / shares					$ 1.50
Sales Incentive, Maximum Number of Shares and Warrants Issuable (in shares)						2,000,000
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares)						500,000
Total Warrants Exercised (in shares)					972,000
Proceeds from Issuance of Warrants | $					$ 1,458,000
Proceeds from Paycheck Protection Program Under CARES Act | $			$ 340,000
Forecast [Member] | Directors [Member]
Stock Issued During Period, Shares, Issued for Services (in shares)	7,077			6,850
Forecast [Member] | A New Employee [Member]
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares)				5,000
Class of Warrant or Right, Vesting Period (Year)				3 years
Forecast [Member] | Warrants Issuable in Connection with Sales Incentive Agreement [Member]
Sales Incentive, Covenant, Warrants Term (Year)						5 years
Class of Warrant or Right, Number of Securities Called by Warrants or Rights, for Each 1,000,000 Revenue in Excess of 20,000,000 (in shares)						100,000
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) | $ / shares						$ 1.50
Forecast [Member] | Warrants Issued in Connection with Senior Secured Convertible Note [Member]
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) | $ / shares		$ 1.16
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares)		1,900,000
Forecast [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%
Convertible Note Due in July 13, 2020 [Member] | Forecast [Member]
Stock Issued During Period, Shares, Commitment Fees (in shares)											50,000
Senior Secured Convertible Note [Member] | Forecast [Member]
Proceeds from Issuance of Debt | $		$ 2,100,000
Debt Instrument, Fee Amount | $		133,333
Debt Instrument, Face Amount | $		$ 2,415,000
Debt Instrument, Number of Monthly Periodic Payments		5
Debt Instrument, Periodic Payment, Principal | $		$ 268,333
Shares Issued, Price Per Share (in dollars per share) | $ / shares		$ 1.16
Stock Issued During Period, Shares, Due Diligence Fees (in shares)		114,943
Share Price (in dollars per share) | $ / shares		$ 1.16
Subsequent Event [Member]
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) | $ / shares															$ 0.65
Subsequent Event [Member] | Convertible Note Due in June 13, 2020 [Member]
Proceeds from Issuance of Debt | $								$ 157,000
Debt Instrument, Convertible, Conversion Price (in dollars per share) | $ / shares								$ 1.50
Debt Instrument, Convertible, Premium Payment Percentage								10.00%
Debt Instrument, Number of Shares Issuable for Commitment Fee (in shares)								650,000
Debt Instrument, Fee Amount | $								$ 75,000
Debt Instrument, Number of Shares Issuable for Commitment Fee if Debt Repayment Occurs Prior to Maturity Date (in shares)								50,000
Subsequent Event [Member] | Convertible Note Due in June 13, 2020 [Member] | Maximum [Member]
Debt Instrument, Convertible, Premium Payment Percentage								30.00%
Subsequent Event [Member] | Convertible Note Due in July 13, 2020 [Member]
Proceeds from Issuance of Debt | $							$ 126,000
Debt Instrument, Convertible, Conversion Price (in dollars per share) | $ / shares							$ 1.15
Debt Instrument, Convertible, Premium Payment Percentage							10.00%
Debt Instrument, Number of Shares Issuable for Commitment Fee (in shares)							550,000
Debt Instrument, Fee Amount | $							$ 57,500
Debt Instrument, Number of Shares Issuable for Commitment Fee if Debt Repayment Occurs Prior to Maturity Date (in shares)							50,000
Subsequent Event [Member] | Convertible Note Due in July 13, 2020 [Member] | Maximum [Member]
Debt Instrument, Convertible, Premium Payment Percentage							30.00%

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