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Condensed Consolidated Balance Sheets (Current Period Unaudited) (Parentheticals) - USD ($)
Mar. 31, 2023
Dec. 31, 2022
Accounts receivable, allowance for doubtful accounts $ 60,628 $ 59,559
Inventories, allowance for excess and obsolete inventory 675,137 663,227
Property and equipment, accumulated depreciation 9,774,851 9,046,499
Intangible assets, accumulated depreciations $ 472,098 $ 438,250
Preferred stock, par value (in dollars per share) $ 0.001 $ 0.001
Preferred stock, shares authorized (in shares) 2,500,000 2,500,000
Preferred stock, shares issued (in shares) 0 0
Preferred stock, shared outstanding (in shares) 0 0
Common stock, par value (in dollars per share) $ 0.001 $ 0.001
Common stock, shares authorized (in shares) 100,000,000 100,000,000
Common stock, shares issued (in shares) 45,271,441 43,986,079
Common stock, shares outstanding (in shares) 45,271,441 43,986,079