Note 11 - Subsequent Events (Details Textual) - USD ($)		3 Months Ended
	Nov. 01, 2020	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Apr. 01, 2020
Shares Issued, Value, Share-based Payment Arrangement, after Forfeiture, Total		$ 149,993	$ 83,284	$ 59,491	$ 92,486	$ 133,515	$ 58,613
Shares Issued, Price Per Share (in dollars per share)								$ 1.08
Subsequent Event [Member]
Shares Issued, Price Per Share (in dollars per share)	$ 1.5779
Chief Executive Officer [Member] | Subsequent Event [Member]
Shares Issued, Shares, Share-based Payment Arrangement, after Forfeiture, Total (in shares)	136,891
Shares Issued, Value, Share-based Payment Arrangement, after Forfeiture, Total	$ 216,000
Treasury Stock, Shares, Acquired (in shares)	54,756