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Statements of Cash Flows (Unaudited Condensed) - USD ($)
 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
CASH FLOWS FROM OPERATING ACTIVITIES:    
Net loss $ (985,136) $ (1,269,442)
Adjustments to reconcile net loss to net cash provided by (used for) operating activities:    
Depreciation 1,691,049 938,416
Amortization 14,328 14,328
Amortization of debt issue costs 12,732 12,612
Deferred income taxes 31,796 447,770
Stock-based compensation 221,569 257,697
Gain on sale of assets (700,000)
Loss on disposal of fixed assets 2,469
Changes in:    
Accounts receivable, gross 45,593 490,050
Accrued interest income (52,947)
Inventory (349,402) (200,210)
Prepaid expenses and other current assets (116,456) (156,185)
Other assets (16,292) (11,547)
Accounts payable and accrued expenses (219,170) (58,545)
Net cash provided by (used for) operating activities 280,133 (235,056)
CASH FLOWS FROM INVESTING ACTIVITIES:    
Purchase of property, plant and equipment (700,017) (1,931,146)
Maturities of investments 2,976,000
Purchases of investments (10,123,000)
Payment of contingent royalties related to 2016 acquisition (8,914) (14,077)
Proceeds from sale of assets 250,000 250,000
Net cash used for investing activities (7,605,931) (1,695,223)
CASH FLOWS FROM FINANCING ACTIVITIES:    
Proceeds from public offering, net 8,303,436
Proceeds from debt issuance 693,640
Line of credit repayment (500,000)
Debt principal repayments (644,129) (183,887)
Payments of debt issue costs (522)
Proceeds from exercise of stock options 2 15,500
Net cash provided by financing activities 7,159,309 524,731
NET DECREASE IN CASH AND CASH EQUIVALENTS (166,489) (1,405,548)
BEGINNING CASH AND CASH EQUIVALENTS 2,521,050 3,798,811
ENDING CASH AND CASH EQUIVALENTS 2,354,561 2,393,263
CASH PAID FOR:    
Income taxes 4,700 4,222
Interest expense 325,343 294,728
NON-CASH ACTIVITIES:    
Change in capital expenditures included in accounts payable and accrued expenses (55,200) (589,964)
Net change in fair value of interest rate swaps, net of taxes 95,387 (74,430)
Fixed asset disposals, gross $ 11,164 $ 18,554