Line of Credit	3 Months Ended
Mar. 31, 2021
Debt Disclosure [Abstract]
Line of Credit	6. Line of Credit The Company has a line of credit with a lender with an initial maturity date of February 23, 2019. The agreement was amended prior to maturity to extend the maturity date to May 2019. In May 2019, the line of credit was amended again to extend the maturity date to May 2021 and increase the maximum borrowing from $25,000,000 to $30,000,000. Interest accrues at an annual rate of prime less 0.25% with a minimum floor of 3.75% (3.75% at March 31, 2021 and December 31, 2020). In September 2019, the Company further increased the maximum borrowing from $30,000,000 to $40,000,000. In July 2020, the line of credit was amended again to extend the maturity date to May 2022. The Company has $33,239,000 and $33,169,000 of line of credit borrowings as of March 31, 2021 and December 31, 2020, respectively. The Company is not required to pay a commitment (unused) fee on the undrawn portion of the line of credit and interest is payable monthly. The amount that can be borrowed is subject to a borrowing base that is calculated as a percentage of the accounts receivable and inventory balances measured monthly. The loan is secured by the Company’s assets and guaranteed by the Company’s stockholders. In accordance with the line of credit agreement, the Company must comply with certain financial covenants, including a minimum current ratio, minimum tangible net worth, minimum debt service coverage ratio, and minimum debt to earnings before interest, taxes, depreciation and amortization (“EBITDA”) ratio. As of March 31, 2021 and December 31, 2020, the Company was in compliance with the financial covenants. The Line of Credit also includes a standby letter of credit sublimit. The amounts issued under the standby letter of credit was $900,000 as of March 31, 2021 and December 31, 2020.

6. Line of Credit

The Company has a line of credit with a lender with an initial maturity date of February 23, 2019. The agreement was amended prior to maturity to extend the maturity date to May 2019. In May 2019, the line of credit was amended again to extend the maturity date to May 2021 and increase the maximum borrowing from $25,000,000 to $30,000,000. Interest accrues at an annual rate of prime less 0.25% with a minimum floor of 3.75% (3.75% at March 31, 2021 and December 31, 2020). In September 2019, the Company further increased the maximum borrowing from $30,000,000 to $40,000,000. In July 2020, the line of credit was amended again to extend the maturity date to May 2022. The Company has $33,239,000 and $33,169,000 of line of credit borrowings as of March 31, 2021 and December 31, 2020, respectively. The Company is not required to pay a commitment (unused) fee on the undrawn portion of the line of credit and interest is payable monthly. The amount that can be borrowed is subject to a borrowing base that is calculated as a percentage of the accounts receivable and inventory balances measured monthly. The loan is secured by the Company’s assets and guaranteed by the Company’s stockholders. In accordance with the line of credit agreement, the Company must comply with certain financial covenants, including a minimum current ratio, minimum tangible net worth, minimum debt service coverage ratio, and minimum debt to earnings before interest, taxes, depreciation and amortization (“EBITDA”) ratio. As of March 31, 2021 and December 31, 2020, the Company was in compliance with the financial covenants. The Line of Credit also includes a standby letter of credit sublimit. The amounts issued under the standby letter of credit was $900,000 as of March 31, 2021 and December 31, 2020.