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Note 2 - Debt (Details Textual)			3 Months Ended		12 Months Ended
	Dec. 14, 2017 USD ($)	Sep. 30, 2016 USD ($)	Mar. 31, 2018 USD ($)	Mar. 31, 2017 USD ($)	Dec. 31, 2017 USD ($)	Nov. 30, 2017 USD ($)
Potential Percent Increase in Interest Rates Contingent on Covenant Compliance					2.00%
Reclassification of Noncurrent Debt to Current Debt			$ 4,400,000
Interest Expense, Total			564,060	$ 377,211
PNC [Member] | Interest Rate Swap [Member] | Designated as Hedging Instrument [Member]
Derivative Liability, Notional Amount	$ 3,000,000
Derivative, Term of Contract	3 years
Maximum [Member]
Fixed Charge Coverage Ratio					1.1
Promissory Note [Member] | John H Schwan [Member]
Proceeds from Related Party Debt		$ 530,000
Due to Related Parties, Total					$ 1,099,000
Interest Payable					400,000
Interest Expense, Total			$ 27,000
BMO [Member]
Long-term Debt, Total						$ 17,000,000
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]
Long-term Debt, Total					$ 6,000,000

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

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

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Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

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