Consolidated Balance Sheets (Current Period Unaudited) (Parentheticals) - USD ($)	Jun. 30, 2021	Dec. 31, 2020
Intangible assets, accumulated amortization	$ 43,851	$ 0
Property and equipment, accumulated depreciation and amortization	$ 324,442	$ 312,320
Common stock, par value (in dollars per share)	$ 0.01	$ 0.01
Common stock, shares authorized (in shares)	30,000,000	30,000,000
Common stock, shares issued (in shares)	13,688,306	12,904,376
Common stock, shares outstanding (in shares)	12,045,690	11,261,760
Treasury stock, shares (in shares)	1,642,616	1,642,616