Note 5 - Shareholders' Equity (Details Textual) - USD ($)				1 Months Ended				3 Months Ended				6 Months Ended		7 Months Ended	12 Months Ended
	Jun. 05, 2020	Apr. 13, 2020	Apr. 01, 2020	Jun. 30, 2021	Feb. 28, 2021	Jan. 31, 2021	Nov. 30, 2020	Jun. 30, 2021	Mar. 31, 2021	Jun. 30, 2020	Mar. 31, 2020	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Dec. 31, 2020
Stock Issued During Period, Value, New Issues										$ 1,800,001	$ 3,626,600
Adjustments to Additional Paid in Capital, Preferred Stock with Beneficial Conversion Feature									$ 1,500,000
Proceeds from Issuance of Convertible Preferred Stock												$ 1,500,000	$ 0
Advance from Investor, Current				$ 1,500,000				$ 1,500,000				$ 1,500,000		$ 1,500,000	$ 1,500,000
Stock Issued During Period, Shares, Warrants Exercised (in shares)															391,308
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Term (Year)												5 years
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Dividend Rate												0.00%
Minimum [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Risk Free Interest Rate												0.42%
Maximum [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Risk Free Interest Rate												1.65%
Series A Preferred Stock [Member]
Proceeds from Issuance of Preferred Stock and Preference Stock												$ 0	5,426,600
Stock Issued During Period, Value, New Issues												1,000,000
Preferred Stock Redemption Premium	$ 2,500,000
Preferred Stock, Dividend Rate, Percentage	8.00%
Preferred Stock, Dividend Rate, Per-Dollar-Amount (in dollars per share)	$ 10
Dividends, Total								100,000		$ 100,000		200,000	$ 152,741
Preferred Stock, Value, Issued, Ending Balance				2,954,583				2,954,583				2,954,583		2,954,583	$ 2,754,583
Series A Preferred Stock [Member] | Conversion of Accounts Receivable Owed to Investor to Preferred Stock [Member]
Debt Conversion, Original Debt, Amount			$ 478,000
Debt Conversion, Converted Instrument, Shares Issued (in shares)			48,200
Series B Preferred Stock [Member]
Proceeds from Issuance of Preferred Stock and Preference Stock							$ 1,500,000
Stock Issued During Period, Value, New Issues									1,612,707					1,646,707
Stock Issued During Period, Shares, New Issues (in shares)							170,000
Preferred Stock, Dividend Rate, Percentage							8.00%
Preferred Stock, Par or Stated Value Per Share (in dollars per share)							$ 10.00
Preferred Stock, Convertible, Conversion Price (in dollars per share)							$ 1.00
Temporary Equity, Carrying Amount, Including Portion Attributable to Noncontrolling Interests, Ending Balance				0			$ 1,500,000	0				0		0	1,532,164
Preferred Stock, Value, Issued, Ending Balance				1,646,707			$ 1,500,000	1,646,707				1,646,707		1,646,707	0
Dividends Payable				81,206				81,206				81,206		81,206
Preferred Stock, Accretion of Redemption Discount												46,932		65,500
Series C Preferred Stock [Member]
Proceeds from Issuance of Preferred Stock and Preference Stock						$ 1,500,000
Stock Issued During Period, Value, New Issues									1,500,000
Stock Issued During Period, Shares, New Issues (in shares)						170,000
Preferred Stock, Dividend Rate, Percentage						8.00%
Preferred Stock, Par or Stated Value Per Share (in dollars per share)						$ 10.00
Preferred Stock, Convertible, Conversion Price (in dollars per share)						$ 1.00
Preferred Stock, Value, Issued, Ending Balance				1,562,333				$ 1,562,333				$ 1,562,333		$ 1,562,333	$ 0
Adjustments to Additional Paid in Capital, Preferred Stock with Beneficial Conversion Feature									$ 1,500,000
Series D Preferred Stock [Member] | Unrelated Third Party [Member]
Proceeds from Issuance of Convertible Preferred Stock				$ 1,500,000
Series A Preferred Stock Warrants [Member]
Class of Warrant or Right, Granted in Period (in shares)															792,660
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares)															792,660
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share)															$ 1
Class of Warrant or Right, Exercised During Period (in shares)					195,160	195,160									597,500
Stock Issued During Period, Shares, Warrants Exercised (in shares)					103,104	103,104
Purchase Agreement [Member] | Series A Preferred Stock [Member]
Sale of Stock, Shares Agreed to Purchase (in shares)		500,000
Second Purchase Agreement Amendment [Member] | Series A Preferred Stock [Member]
Shares Issued, Price Per Share (in dollars per share)		$ 10.00
Proceeds from Issuance of Preferred Stock and Preference Stock		$ 5,000,000
Second Purchase Agreement Amendment [Member] | Series A Preferred Stock [Member] | Conversion from Each Share Series A Preferred Stock to Common Stock [Member]
Conversion of Stock, Shares Converted (in shares)		10
Additional Offering [Member] | Series A Preferred Stock [Member]
Sale of Stock, Contingent Additional Offered Shares (in shares)		200,000
Additional Shares Offering [Member] | Series A Preferred Stock [Member]
Sale of Stock, Price Per Share (in dollars per share)		$ 10.00
Equity Financing Arrangement [Member] | Common Stock [Member]
Stock Issued During Period, Shares, New Issues (in shares)													400,000