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Note R - Equity (Details Textual)					1 Months Ended		4 Months Ended	12 Months Ended		24 Months Ended
	Nov. 20, 2020	Jul. 23, 2020 USD ($) shares	Mar. 30, 2020 USD ($) $ / shares shares	Feb. 14, 2020 USD ($) $ / shares shares	Nov. 30, 2020 USD ($) shares	Aug. 31, 2020 USD ($) shares	Nov. 30, 2020	Dec. 31, 2020 USD ($) $ / shares shares	Dec. 31, 2019 USD ($) shares	Dec. 31, 2020 $ / shares shares	Sep. 30, 2020 USD ($) shares	Jun. 30, 2020 USD ($) shares	Mar. 12, 2020 $ / shares	Sep. 23, 2015 $ / shares shares	Nov. 13, 2014 shares
Preferred Stock, Shares Authorized (in shares)								5,000,000		5,000,000
Preferred Stock, Par or Stated Value Per Share (in dollars per share) | $ / shares								$ 0.0001		$ 0.0001
Stock Issued During Period, Shares, Warrants Exercises (in shares)			121,500
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) | $ / shares			$ 12	$ 5.20
Proceeds from Warrant Exercises | $			$ 1,458,000					$ 5,602,595
Stock Issued During Period, Shares, Restricted Stock Award, Net of Forfeitures, Total (in shares)					3,125	38,250
Share-based Payment Arrangement, Expense | $								792,095	947,720
Shares Issued, Value, Share-based Payment Arrangement, after Forfeiture, Total | $								$ 28,511	$ 35,013
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period (in shares)								0	0
Dividends, Paid-in-kind, Total | $				$ 41,688				$ 112,686
Convertible Note Due in July 13, 2020 [Member]
Debt Instrument, Convertible, Conversion Price (in dollars per share) | $ / shares				$ 9.20
Senior Secured Convertible Note [Member] | Amended Note [Member]
Debt Instrument, Convertible, Conversion Price (in dollars per share) | $ / shares				$ 5.20									$ 5.20
Common Stock [Member]
Stock Issued During Period, Shares, New Issues (in shares)								43,939
Stock Issued During Period, Shares, Conversion of Warrant (in shares)								918,538
Stock Issued During Period, Shares, Restricted Stock Award, Net of Forfeitures, Total (in shares)								41,375
Shares Issued, Shares, Share-based Payment Arrangement, after Forfeiture, Total (in shares)								5,270	4,612
Shares Issued, Value, Share-based Payment Arrangement, after Forfeiture, Total | $									$ 1
Director [Member] | Common Stock [Member]
Shares Issued, Shares, Share-based Payment Arrangement, after Forfeiture, Total (in shares)								5,270	4,612
Shares Issued, Value, Share-based Payment Arrangement, after Forfeiture, Total | $								$ 28,511	$ 35,013
Restricted Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period (Year)							3 years
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Fair Value | $					$ 11,250	$ 198,900
Share-based Payment Arrangement, Expense | $								$ 23,764
Pre-Funded Warrants [Member]
Class of Warrant or Right, Exercised During Period (in shares)		512,500
Equity Warrants [Member]
Class of Warrant or Right, Exercised During Period (in shares)		284,538
September 2015 Warrants [Member]
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) | $ / shares														$ 28.80
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares)				48,078										8,681
Warrants and Rights Outstanding, Term (Year)														5 years
Referral Fee Warrants [Member]
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares)											3,125	15,625
Warrants and Rights Outstanding | $											$ 12,921	$ 94,655
Warrants in Connection With May 2020 and June 2020 Notes [Member]
Class of Warrant or Right, Issued During Period (in shares)								415,625
Warrants in Connection With the Securities Purchase Agreement [Member]
Class of Warrant or Right, Issued During Period (in shares)									250,000
Public Offering [Member]
Proceeds from Issuance or Sale of Equity, Total | $		$ 22,700,000
Stock Issued During Period, Shares, New Issues (in shares)		4,264,313
Stock Issued During Period, Shares, Conversion of Warrant (in shares)		797,038
Public Offering [Member] | Common Stock [Member]
Stock Issued During Period, Shares, New Issues (in shares)								4,264,313
Private Investor SPA [Member]
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares)															124,610
Reverse Stock Split [Member]
Stockholders' Equity Note, Stock Split, Conversion Ratio	8

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