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Note 3 - Debt (Details Textual)					3 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 ($)	Dec. 31, 2018 USD ($)	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 (Year)				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 (in shares) | shares	180,723
Repayments of Related Party Debt							$ 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 (Week)					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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