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v3.22.1

Note 9 - Notes Payable (Details Textual) - USD ($) |  |  |  | 1 Months Ended | 3 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | --- | --- | --- | --- | ---
Sep. 30, 2021 | Apr. 23, 2021 | Apr. 30, 2020 | Jan. 31, 2019 | Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2021 | Dec. 31, 2020 | Jan. 01, 2019 | Dec. 31, 2017
Long-term Debt, Total |  |  |  |  | $ 6,921,487 | $ 8,622,580 | $ 6,921,487 | $ 8,622,580 |  |
Share Price (in dollars per share) |  |  |  | $ 3.32 |  |  |  |  |  |
Other Income, Paycheck Protection Program Grant |  |  |  |  |  |  |  | 1,048,000 |  |
Deferred Other Income Liability |  |  |  |  |  | 0 |  | 0 |  |
Conversion of Related Party Debt to Equity [Member] |  |  |  |  |  |  |  |  |  |
Debt Conversion, Original Debt, Amount |  |  |  | $ 600,000 |  |  |  |  |  |
Debt Conversion, Converted Instrument, Shares Issued (in shares) |  |  |  | 181,000 |  |  |  |  |  |
John H Schwan [Member] |  |  |  |  |  |  |  |  |  |
Due to Related Parties, Total |  |  |  |  | 1,175,361 | 1,123,769 | 1,175,361 | 1,123,769 |  |
Term Loan [Member] |  |  |  |  |  |  |  |  |  |
Long-term Debt, Total |  |  |  |  | 559,140 | 2,156,895 | 559,140 | 2,156,895 |  |
Interest Payable |  |  |  |  | 714,094 |  | 714,094 |  |  |
Debt Issuance Costs, Net, Total |  |  |  |  | 154,951 |  | 154,951 |  |  |
Line of Credit [Member] | Revolving Credit Facility [Member] |  |  |  |  |  |  |  |  |  |
Long-term Debt, Total |  |  |  |  | 5,002,599 | 5,341,916 | 5,002,599 | 5,341,916 |  |
Promissory Note [Member] | John H Schwan [Member] |  |  |  |  |  |  |  |  |  |
Due to Related Parties, Noncurrent, Total |  |  |  | $ 997,019 |  |  |  |  | $ 1,600,000 |
Repayments of Related Party Debt |  |  |  |  |  |  | 0 | 0 |  |
Interest Expense, Related Party |  |  |  |  | 17,000 | $ 16,000 | 70,000 | $ 65,000 |  |
Promissory Note [Member] | Alex Feng [Member] |  |  |  |  |  |  |  |  |  |
Due to Related Parties, Noncurrent, Total |  |  |  |  | $ 166,667 |  | $ 166,667 |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  |  |  |  | 3.00% |  | 3.00% |  |  |
Line Financial Agreement [Member] |  |  |  |  |  |  |  |  |  |
Debt Instrument, Number of Installments for Periodic Payment | 48 |  |  |  |  |  |  |  |  |
Debt Instrument, Periodic Payment, Total | $ 15,234 |  |  |  |  |  |  |  |  |
Debt Instrument, Collateral Monitoring Fee, Percent | 4.62% |  |  |  |  |  |  |  |  |
Debt Instrument, Fee Amount, Percent | 1.25% |  |  |  |  |  |  |  |  |
Debt Instrument, Extension Term (Year) | 1 year |  |  |  |  |  |  |  |  |
Debt Instrument, Renewal Fee, Percent | 1.25% |  |  |  |  |  |  |  |  |
Debt Instrument, Covenant, Tangible Net Worth | $ 4,000,000 |  |  |  |  |  |  |  |  |
Line Financial Agreement [Member] | Maximum [Member] |  |  |  |  |  |  |  |  |  |
Debt Instrument, Covenant, Expenditures Amount | $ 1,000,000 |  |  |  |  |  |  |  |  |
Line Financial Agreement [Member] | Prime Rate [Member] |  |  |  |  |  |  |  |  |  |
Debt Instrument, Reference Rate | 3.25% |  |  |  |  |  |  |  |  |
Debt Instrument, Basis Spread on Variable Rate | 1.95% |  |  |  |  |  |  |  |  |
Paycheck Protection Program CARES Act [Member] |  |  |  |  |  |  |  |  |  |
Proceeds from Issuance of Debt |  |  | $ 1,047,700 |  |  |  |  |  |  |
PNC [Member] | PNC Agreements [Member] |  |  |  |  |  |  |  |  |  |
Debt Instrument, Forbearance Fee | $ 250,000 | $ 1,000,000 |  |  |  |  |  |  |  |
Debt Instrument, Increase (Decrease) in Forbearance Fee if Equity Issuance Occurs |  | (250,000) |  |  |  |  |  |  |  |
Debt Instrument, Forbearance Fee if Equity Issuance Occurs |  | 750,000 |  |  |  |  |  |  |  |
Debt Instrument, Increase (Decrease) in Forbearance Fee if Full Cash Payments Received |  | (500,000) |  |  |  |  |  |  |  |
Debt Instrument, Forbearance Fee if Full Cash Payments Received |  | 250,000 |  |  |  |  |  |  |  |
Forbearance Expense |  |  |  |  |  |  | $ 250,000 |  |  |
PNC [Member] | PNC Agreements [Member] | Revolving Credit Facility [Member] |  |  |  |  |  |  |  |  |  |
Line of Credit Facility, Maximum Borrowing Capacity |  |  |  |  |  |  |  |  |  | $ 18,000,000
PNC [Member] | PNC Agreements [Member] | Term Loan [Member] |  |  |  |  |  |  |  |  |  |
Debt Instrument, Face Amount |  |  |  |  |  |  |  |  |  | $ 6,000,000
Long-term Debt, Total |  | $ 2,000,000 |  |  |  |  |  |  |  |
Line Financial [Member] | Line Financial Agreement [Member] | Revolving Credit Facility [Member] |  |  |  |  |  |  |  |  |  |
Line of Credit Facility, Maximum Borrowing Capacity | 6,000,000 |  |  |  |  |  |  |  |  |
Line Financial [Member] | Line Financial Agreement [Member] | Term Loan [Member] |  |  |  |  |  |  |  |  |  |
Debt Instrument, Face Amount | $ 731,250 |  |  |  |  |  |  |  |  |

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