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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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Amount of fee associated with the amendment of debt agreement.

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The number of shares issued in exchange for the original debt being converted in a noncash (or part noncash) transaction. "Part noncash" refers to that portion of the transaction not resulting in cash receipts or payments in the period.

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