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Condensed Consolidated Balance Sheets (Current Period Unaudited) (Parentheticals) - USD ($)
Mar. 31, 2022
Dec. 31, 2021
Accounts receivable, allowance for doubtful accounts $ 312,677 $ 409,076
Inventories, allowance for excess and obsolete inventory 262,901 268,470
Property and equipment, accumulated depreciation 7,829,488 7,554,803
Intangible assets, accumulated depreciations $ 376,375 $ 357,231
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) 21,352,688 21,285,706
Common stock, shares outstanding (in shares) 21,352,688 21,285,706