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Note 6 - Accrued Expenses and Other Current Liabilities - Accrued Expenses and Other Current Liabilities (Details) - USD ($)	Sep. 30, 2021	Dec. 31, 2020
Deferred revenue	$ 3,587,390	$ 3,280,947
Compensation	2,420,266	2,933,738
Research and development vendor costs	585,854	327,606
Professional fees	585,019	251,824
Inventory	462,390	150,349
Other	416,966	486,158
Vacation	376,303	405,176
Income tax payable	48,257	919,555
Accrued expenses and other current liabilities	8,979,128	9,205,293
Accrued Expenses and Other Current Liabilities [Member]
Lease liability, current portion	$ 496,683	$ 449,940

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Carrying value as of the balance sheet date of obligations incurred and payable, pertaining to accrued research and development costs (due within one year or within the normal operating cycle if longer).

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Carrying value as of the balance sheet date of obligations incurred (and for which invoices have typically been received) and payable to vendors for goods and services received that are used in an entity's business. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer).

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Carrying value as of the balance sheet date of obligations incurred and payable for incentive compensation awarded to employees and directors or earned by them based on the terms of one or more relevant arrangements. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer).

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Carrying amount as of the balance sheet date of the unpaid sum of the known and estimated amounts payable to satisfy all currently due domestic and foreign income tax obligations.

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Carrying value as of the balance sheet date of obligations incurred and payable, pertaining to costs that are statutory in nature, are incurred on contractual obligations, or accumulate over time and for which invoices have not yet been received or will not be rendered. Examples include taxes, interest, rent and utilities. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer).

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Carrying value as of the balance sheet date of obligations incurred through that date and payable for professional fees, such as for legal and accounting services received. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer).

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Carrying value as of the balance sheet date of obligations incurred and payable for unused vacation time owed to employees based on the entity's vacation benefit given to its employees. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer).

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Amount of obligation to transfer good or service to customer for which consideration has been received or is receivable, classified as current.

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