Condensed Consolidated Balance Sheets (Current Period Unaudited) (Parentheticals) - USD ($)	Mar. 31, 2024	Dec. 31, 2023
Accounts receivable, allowance for doubtful accounts	$ 169,522	$ 134,912
Inventories, allowance for excess and obsolete inventory	792,354	867,458
Property and equipment, accumulated depreciation	12,085,314	11,828,200
Intangible assets, accumulated depreciations	$ 572,142	$ 558,555
Preferred stock, par value (in dollars per share)	$ 0.001	$ 0.001
Preferred stock, authorized (in shares)	2,500,000	2,500,000
Preferred stock, issued (in shares)	0	0
Common stock, par value (in dollars per share)	$ 0.001	$ 0.001
Common stock, authorized (in shares)	50,000,000	50,000,000
Common stock, issued (in shares)	5,807,340	5,727,310
Common stock, outstanding (in shares)	5,807,340	5,727,310