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Note 4 - Debt (Details Textual) - USD ($) |  |  |  | 3 Months Ended | 6 Months Ended | 9 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Jan. 11, 2019 | Oct. 08, 2018 | Jun. 08, 2018 | Mar. 31, 2020 | Mar. 31, 2019 | Jun. 30, 2019 | Sep. 30, 2018 | Dec. 31, 2019 | Jul. 01, 2019 | Dec. 31, 2017
Proceeds from Issuance or Sale of Equity, Total |  |  |  | $ 3,626,600 |  |  |  |  |  |
Fixed Charge Coverage Ratio |  |  |  | 0.75 |  |  |  |  |  |
Interest Expense, Total |  |  |  | 441,177 | 564,160 |  |  |  |  |
Due from Related Parties, Current, Total |  |  |  | 1,386,638 |  |  |  | $ 1,387,131 |  |
Board of Directors Chairman [Member] |  |  |  |  |  |  |  |  |  |
Due from Related Parties, Current, Total |  |  |  |  |  |  |  |  | $ 1,300,000 |
Promissory Note [Member] | John H Schwan [Member] |  |  |  |  |  |  |  |  |  |
Due to Related Parties, Total |  |  |  |  |  |  |  |  |  | $ 1,099,000
Interest Payable |  |  |  |  |  |  |  |  |  | 400,000
Debt Conversion, Original Debt, Amount | $ 600,000 |  |  |  |  |  |  |  |  |
Accounts Receivable, Shares Converted to Preferred Stock (in shares) | 181,000 |  |  |  |  |  |  |  |  |
Repayments of Related Party Debt |  |  |  | 0 |  |  |  | $ 0 |  |
Interest Expense, Total |  |  |  | $ 16,000 | $ 15,000 |  |  |  |  |
PNC [Member] | PNC Agreements [Member] |  |  |  |  |  |  |  |  |  |
Debt Instrument, Temporary Over-Advance |  |  |  |  |  | $ 1,200,000 |  |  |  |
Debt Instrument, Temporary Over-Advance, End Balance |  |  |  |  |  | $ 0 |  |  |  |
Debt Instrument, Temporary Over-Advance, Term (Week) |  |  |  |  |  | 42 days |  |  |  |
Debt instrument, Amendment Fee |  |  |  |  |  | $ 250,000 |  |  |  |
Debt Instrument, Interest Rate, Increase (Decrease) |  |  | 2.00% |  |  |  |  |  |  |
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] |  |  |  |  |  |  |  |  |  |
Long-term Debt, Total |  |  |  |  |  |  |  |  |  | $ 6,000,000
PNC [Member] | PNC Agreements, Amendment Two [Member] |  |  |  |  |  |  |  |  |  |
Debt Instrument, Funding Proceeds Used to Repay Term Loan |  | $ 2,000,000 |  |  |  |  | $ 5,000,000 |  |  |
Debt Instrument, Covenant, Required Proceeds from Equity Issuance |  | 7,500,000 |  |  |  |  |  |  |  |
Proceeds from Issuance or Sale of Equity, Total |  | $ 0 |  |  |  |  |  |  |  |

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