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Note 2 - Debt (Details Textual)				1 Months Ended	2 Months Ended	3 Months Ended		9 Months Ended
	Oct. 08, 2018 USD ($)	Jun. 08, 2018 USD ($)	Dec. 14, 2017 USD ($)	Apr. 30, 2018 USD ($)	May 31, 2018 USD ($)	Sep. 30, 2018 USD ($)	Sep. 30, 2017 USD ($)	Sep. 30, 2018 USD ($)	Sep. 30, 2017 USD ($)	Dec. 31, 2017 USD ($)
Repayments of Related Party Debt								$ 17,000	$ 0
Interest Expense, Total						$ 471,268	$ 367,391	1,586,108	$ 1,100,038
PNC [Member] | Interest Rate Swap [Member] | Designated as Hedging Instrument [Member]
Derivative Liability, Notional Amount			$ 3,000,000
Derivative, Term of Contract			3 years
Promissory Note [Member] | John H Schwan [Member]
Due to Related Parties, Total										$ 1,100,000
Interest Payable										400,000
Repayments of Related Party Debt						0
Interest Expense, Total						$ 23,000
BMO [Member]
Long-term Debt, Total										17,000,000
PNC [Member] | PNC Agreements [Member]
Debt Instrument, Minimum EBITDA				$ 300,000	$ 750,000
Debt instrument, Amendment Fee		$ 58,750
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] | Minimum [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								$ 5,000,000
PNC [Member] | PNC Agreements, Amendment Two [Member] | Subsequent Event [Member]
Debt Instrument, Funding Proceeds Used to Repay Term Loan	$ 2,000,000
Debt Instrument, Covenant, Required Proceeds from Equity Issuance	7,500,000
Debt instrument, Amendment Fee	$ 34,500

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Amount of fee associated with the amendment of debt agreement.

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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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Carrying amount as of the balance sheet date of obligations due all related parties.

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Amount of the cost of borrowed funds accounted for as interest expense.

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