Consolidated Balance Sheets - USD ($)	Jun. 30, 2021	Dec. 31, 2020
Current assets
Cash and cash equivalents	$ 812,373	$ 771,757
Restricted cash	750,000	800,000
Accounts receivable, net of allowance of doubtful accounts of $173,603 as of June 30, 2021 and December 31, 2020	9,254,845	9,203,334
Inventories, net	19,579,030	16,504,840
Prepaid expenses and other current assets	304,455	399,119
Total current assets	30,700,703	27,679,050
Equipment, net	633,662	455,066
Operating lease right-of-use assets, net	91,179	86,948
Goodwill	58,872	58,872
Intangible assets, net	332,963	388,629
Other assets	845,855	942,404
Total assets	32,663,234	29,610,969
Current liabilities
Bank credit line	7,228,672	2,442,246
Accounts payable	12,204,708	11,744,834
Current maturities of government loan	60,470	65,225
Current maturities of operating lease liabilities	92,654	65,651
Accrued expenses	5,045,579	7,465,063
Deferred revenue, current	349,961
Total current liabilities	24,982,044	21,783,019
Long term government loan, less current maturities		15,245
Operating lease liabilities, less current maturities		22,235
Deferred revenue, noncurrent	652,899
Total Liabilities	25,634,943	21,820,499
Commitments and Contingencies (Note 6)
Stockholders’ equity
Common Stock: Authorized: 40,000,000 shares at $0.01 par value; issued and outstanding: 35,631,239 shares at June 30, 2021 and 35,074,922 shares at December 31, 2020, respectively	356,350	350,749
Additional paid-in capital	65,858,315	64,526,664
Accumulated deficit	(59,186,374)	(57,086,943)
Total stockholders’ equity	7,028,291	7,790,470
Total liabilities and stockholders’ equity	$ 32,663,234	$ 29,610,969