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Consolidated Balance Sheets (Unaudited) - USD ($)
Mar. 31, 2019
Dec. 31, 2018
Current assets:    
Cash $ 1,336,754 $ 2,317,659
Restricted cash 109,892 130,326
Accounts receivable, net of $50,000 allowance for doubtful accounts 2,495,828 2,217,877
Inventory 1,345,667 1,563,593
Prepaid expenses and other current assets 309,223 285,580
Total current assets 5,597,364 6,515,035
Property, plant and equipment, net 5,015,358 5,014,494
Investment 324,930 324,930
Other assets 90,319 90,319
Right-of-use assets 1,396,278
Goodwill 2,453,597 2,453,597
Other intangible assets, net 1,291,868 881,411
Total assets 16,169,714 15,279,786
Current liabilities:    
Accounts payable 1,246,798 1,347,491
Accrued expenses and deferred revenue 965,652 1,106,346
Other current liabilities 1,846,281 2,255,942
Current portion of long-term debt, net 698,369 713,427
Current portion of lease liability 360,839
Total current liabilities 5,117,939 5,423,206
Long-term debt, net 1,680,285 1,721,936
Lease liability 1,059,802
Other long-term liabilities 350,906 391,325
Deferred tax liability, net 168,986 168,986
Commitments and contingencies (Note 9)  
Stockholders' equity    
Common stock, $.02 par value; 200,000,000 shares authorized, 18,002,721 shares issued and outstanding (17,425,858 on December 31, 2018) 360,054 348,517
Additional paid-in capital 108,281,820 107,624,666
Accumulated other comprehensive loss (7,830) (7,052)
Accumulated deficit (100,842,248) (100,391,798)
Total stockholders' equity 7,791,796 7,574,333
Total liabilities and stockholders' equity $ 16,169,714 $ 15,279,786