Note 17 - Stockholders' Equity (Details Textual)				3 Months Ended			6 Months Ended
	Nov. 20, 2020	Mar. 30, 2020 USD ($) $ / shares shares	Sep. 23, 2015 USD ($) $ / shares shares	Jun. 30, 2021 USD ($) $ / shares shares	Mar. 31, 2021 USD ($) shares	Jun. 30, 2020 USD ($) shares	Jun. 30, 2021 USD ($) $ / shares shares	Jun. 30, 2020 USD ($) 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				$ 1			$ 1
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		$ 12.00	$ 28.80
Proceeds from Warrant Exercises | $		$ 1,458,000					$ 0	$ 1,458,000
Share-based Payment Arrangement, Expense | $				$ 41,123		$ 142,839	$ 182,271	$ 655,558
Shares Issued, Value, Share-based Payment Arrangement, after Forfeiture, Total | $				$ 5,505	$ 7,510	$ 15,007
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period (in shares)				0		0	0	0
Class of Warrant or Right, Issued During Period (in shares)				0			0
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares)			8,681
Dividends, Paid-in-kind, Total | $			$ 41,688	$ (0)		$ (0)	$ (0)	$ 112,686
Referral Fee Warrants [Member]
Class of Warrant or Right, Issued During Period (in shares)						94,655
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares)						125,000		125,000
September 2015 Warrants [Member]
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) | $ / shares			$ 5.20
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares)			48,078
Warrants and Rights Outstanding, Term (Year)			5 years
Common Stock [Member]
Stock Issued During Period, Shares, Restricted Stock Award, Net of Forfeitures, Total (in shares)				1,250	1,250
Stock Issued During Period, Shares, Restricted Stock Award, Forfeited (in shares)				1,250
Shares Issued, Shares, Share-based Payment Arrangement, after Forfeiture, Total (in shares)				1,748	2,091	2,143
Shares Issued, Value, Share-based Payment Arrangement, after Forfeiture, Total | $				$ 0	$ 0	$ 1
Director [Member] | Common Stock [Member]
Shares Issued, Shares, Share-based Payment Arrangement, after Forfeiture, Total (in shares)				1,748		2,143	3,839	2,143
Shares Issued, Value, Share-based Payment Arrangement, after Forfeiture, Total | $				$ 5,505		$ 15,007	$ 13,015	$ 15,007
Restricted Stock [Member]
Stock Issued During Period, Shares, Restricted Stock Award, Net of Forfeitures, Total (in shares)							2,500
Stock Issued During Period, Shares, Restricted Stock Award, Forfeited (in shares)							1,250
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 | $							$ 8,425
Share-based Payment Arrangement, Expense | $				$ 16,346		$ 0	$ 33,721	$ 0
Reverse Stock Split [Member]
Stockholders' Equity Note, Stock Split, Conversion Ratio	8