Note 6 - Long-term Debt (Details Textual) $ in Thousands									6 Months Ended	12 Months Ended
	Nov. 01, 2019	Jan. 22, 2019 USD ($)	Jul. 01, 2018 USD ($)	May 02, 2018 USD ($)	Feb. 28, 2017 USD ($)	Feb. 24, 2017 USD ($)	Mar. 08, 2016 USD ($)	Jul. 01, 2014 USD ($)	Oct. 31, 2019	Dec. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)	Dec. 31, 2016 USD ($)	May 01, 2018 USD ($)	Mar. 01, 2018 USD ($)	Mar. 07, 2016 USD ($)	Dec. 31, 2015 USD ($)
Long-term Debt, Maturities, Repayments of Principal in Next Twelve Months										$ 6,000
Long Term Debt Maturities Repayments of Principal in Year Six										1,500
Repayments of Long-term Debt, Total										127,439	$ 77,573	$ 106,827
Long-term Debt, Gross										117,693	38,975
Long-term Debt, Maturities, Repayments of Principal in Year Two										6,000
Derivative, Fixed Interest Rate							2.43%	2.53%						3.12%
Derivative, Notional Amount								$ 14,300
Long Term Debt Maturities Repayments of Principal in Year Seven													$ 3,050
Stockholders' Equity Attributable to Parent, Ending Balance										150,921	$ 124,968	$ 110,550				$ 92,690
Long-term Debt, Maturities, Repayments of Principal in Year Three										6,000
Long-term Debt, Maturities, Repayments of Principal in Year Four										6,000
Long-term Debt, Maturities, Repayments of Principal in Year Five										6,000
Per Month through July 1, 2015 [Member]
Debt Instrument, Periodic Payment, Principal								200
Per Month through June 1, 2018 [Member]
Debt Instrument, Periodic Payment, Principal								$ 300
Interest Rate Swap [Member]
Derivative, Notional Amount														$ 18,000
Derivative Instruments, Gain Reclassified from Accumulated OCI into Income, Effective Portion						$ 100
Derivative, Notional Amount, Monthly Reduction Amount														$ 300
Interest Rate Swap [Member] | Accumulated Gain (Loss), Net, Cash Flow Hedge, Parent [Member]
Stockholders' Equity Attributable to Parent, Ending Balance										100
Interest Rate Swap [Member] | Other Current Liabilities [Member]
Derivative, Notional Amount				$ 17,500
Derivative Liability, Total				100
Interest Rate Swap [Member] | Prepaid Expenses and Other Current Assets [Member]
Derivative Asset, Total										100
Credit Agreement [Member]
Debt Issuance Costs, Gross										$ 100
Credit Agreement [Member] | Term Loan 2 [Member]
Debt Instrument, Face Amount				$ 85,000
Debt Instrument, Interest Rate, Effective Percentage										3.39%
Debt Instrument, Commitment Fee				0.25%
Credit Agreement [Member] | Term Loan 2 [Member] | Subsequent Event [Member]
Debt Instrument, Face Amount		$ 85,000
Long-term Debt, Maturities, Repayments of Principal in Next Twelve Months		8,500
Long Term Debt Maturities Repayments of Principal in Year Six		9,300
Repayments of Long-term Debt, Total		20,000
Long-term Debt, Gross		65,000
Long-term Debt, Maturities, Repayments of Principal in Year Two		9,300
Long Term Debt Maturities Repayments of Principal in Year Eight		800
Long Term Debt Maturities Repayments of Principal in Year Seven		9,300
Long-term Debt, Maturities, Repayments of Principal in Year Three		9,300
Long-term Debt, Maturities, Repayments of Principal in Year Four		9,300
Long-term Debt, Maturities, Repayments of Principal in Year Five		$ 9,300
Credit Agreement [Member] | Term Loan [Member]
Debt Instrument, Face Amount				$ 42,000
Debt Instrument, Interest Rate, Effective Percentage										3.14%
Credit Agreement [Member] | London Interbank Offered Rate (LIBOR) [Member] | Term Loan 2 [Member]
Debt Instrument, Basis Spread on Variable Rate				0.93%
Credit Agreement [Member] | London Interbank Offered Rate (LIBOR) [Member] | Term Loan 2 [Member] | Subsequent Event [Member]
Debt Instrument, Basis Spread on Variable Rate		0.85%
Credit Agreement [Member] | London Interbank Offered Rate (LIBOR) [Member] | Term Loan [Member]
Debt Instrument, Basis Spread on Variable Rate				0.68%
Amended and Restated Credit Agreement [Member]
Debt Issuance Costs, Gross										$ 200
Fifth Third Bank [Member] | Interest Rate Swap [Member]
Debt Instrument, Periodic Payment, Principal			$ 3,300
Amended Credit Agreement [Member]
Fixed Charge Coverage Ratio										1.25
EBITA Ratio										4
Amended Credit Agreement [Member] | Term Loan [Member]
Debt Instrument, Face Amount					$ 42,000		$ 45,000
Amended Credit Agreement [Member] | Term Loan [Member] | London Interbank Offered Rate (LIBOR) [Member]
Debt Instrument, Basis Spread on Variable Rate							0.85%
Scenario, Forecast [Member] | Credit Agreement [Member] | London Interbank Offered Rate (LIBOR) [Member] | Term Loan [Member]
Debt Instrument, Basis Spread on Variable Rate									1.50%
Scenario, Forecast [Member] | Amended and Restated Credit Agreement After 18 Months [Member] | London Interbank Offered Rate (LIBOR) [Member] | Term Loan [Member]
Debt Instrument, Basis Spread on Variable Rate	1.75%
Revolving Credit Facility [Member] | Credit Agreement [Member] | Fifth Third Bank [Member]
Line of Credit Facility, Maximum Borrowing Capacity													$ 35,000
Revolving Credit Facility [Member] | Credit Agreement [Member] | BB&T [Member]
Line of Credit Facility, Maximum Borrowing Capacity				$ 75,000
Line of Credit Facility, Unused Capacity, Commitment Fee Percentage				0.10%
Revolving Credit Facility [Member] | Amended Credit Agreement [Member]
Line of Credit Facility, Expiration Period					7 years		5 years
Line of Credit Facility, Maximum Borrowing Capacity					$ 35,000		$ 20,000								$ 15,000
Line of Credit Facility, Commitment Fee Percentage					0.10%		0.10%
Letters of Credit Outstanding, Amount										$ 0
Add on Credit Facility [Member] | London Interbank Offered Rate (LIBOR) [Member]
Debt Instrument, Basis Spread on Variable Rate					0.75%		0.85%