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Note 3 - Debt (Details Textual)					3 Months Ended		9 Months Ended	12 Months Ended
	Jan. 11, 2019 USD ($) shares	Oct. 08, 2018 USD ($)	Jun. 08, 2018	Dec. 14, 2017 USD ($)	Mar. 31, 2019 USD ($)	Mar. 31, 2018 USD ($)	Sep. 30, 2018 USD ($)	Dec. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)
Interest Expense, Total					$ 546,906	$ 564,060
PNC [Member] | Interest Rate Swap [Member] | Designated as Hedging Instrument [Member]
Derivative Liability, Notional Amount				$ 3,000,000
Derivative, Term of Contract				3 years
Derivative, Fixed Interest Rate				2.25%
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
Debt Conversion, Converted Instrument, Shares Issued | shares	180,723
Repayments of Related Party Debt					0			$ 0
Interest Expense, Total					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					42 days
Debt instrument, Amendment Fee					$ 250,000
Debt Instrument, Interest Rate, Increase (Decrease)			2.00%
PNC [Member] | PNC Agreements [Member] | Maximum [Member]
Fixed Charge Coverage Ratio			1.1
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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Incremental percentage increase (decrease) in the stated rate on a debt instrument.

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Fixed interest rate related to the interest rate derivative.

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Nominal or face amount used to calculate payments on the derivative liability.

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Period the derivative contract is outstanding, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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