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Percentage points added to the reference rate to compute the variable rate on the debt instrument.

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The average effective interest rate during the reporting period.

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Contractual interest rate for funds borrowed, under the debt agreement.

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Amount of the required periodic payments including both interest and principal payments.

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Fixed interest rate related to the interest rate derivative.

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Fair value of the amount outstanding under the credit facility.

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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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Amount of borrowing capacity currently available under the credit facility (current borrowing capacity less the amount of borrowings outstanding).

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The fee, expressed as a percentage of the line of credit facility, for available but unused credit capacity under the credit facility.

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Amount of long-term debt payable, sinking fund requirements, and other securities issued that are redeemable by holder at fixed or determinable prices and dates maturing in the next fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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Amount after unamortized (discount) premium and debt issuance costs of long-term debt classified as noncurrent and excluding amounts to be repaid within one year or the normal operating cycle, if longer. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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DEBT AND CREDIT AGREEMENTS (Details) - USD ($) $ in Thousands			3 Months Ended	12 Months Ended
	Feb. 25, 2019	Oct. 26, 2016	Mar. 31, 2020	Dec. 31, 2019	Apr. 30, 2020	Jun. 30, 2019	Dec. 31, 2016
Credit Facilities
Line of credit			$ 14,000
Less: Current portion			(16,350)	$ (12,917)
Long-term debt, net of current maturities			355	505
Future annual principal payments
2020			16,812
Swap agreement notional amount						$ 6,000
Interest rate on notional amount of debt						2.13%
Capital Expenditure loan
Credit Facilities
Long-term debt			$ 2,363	1,563
Future annual principal payments
Interest rate (as a percent)			5.00%
Current maturities of long-term debt			$ 2,350	1,400
Capital Expenditure loan \| Minimum
Future annual principal payments
Monthly payments on notes payable			1
Capital Expenditure loan \| Maximum
Future annual principal payments
Monthly payments on notes payable			36
Development Corporation of Abilene loan
Credit Facilities
Long-term debt			342	342			$ 570
Future annual principal payments
Loan forgiven				114
Paycheck Protection Program loan
Credit Facilities
Long-term debt					$ 9,530
Credit facility
Future annual principal payments
Maximum borrowing capacity	$ 35,000
Line of credit facilities, term of credit agreements		3 years
Line of credit, term extended	3 years
Maximum borrowing capacity of the face value of eligible receivable (as a percent)	85.00%
Maximum percentage of lower of cost or market value of eligible inventories	50.00%
Maximum percentage of orderly liquidation value of eligible inventories	85.00%
Additional maximum borrowing capacity	$ 12,500
Percentage of net orderly liquidation value		75.00%
Percentage of fair market value of mortgaged property	50.00%
Maximum borrowing restricted value	$ 12,000
Interest rate base (as a percent)		3.50%
Unused facility fee (as a percent)	0.50%
Current borrowing capacity			16,283
Credit facility \| LIBOR
Future annual principal payments
Interest rate margin (as a percent)	5.50%
Credit facility \| Minimum \| LIBOR
Future annual principal payments
Interest rate margin (as a percent)	2.25%
Interest rate (as a percent)	0.00%
Credit facility \| Maximum \| LIBOR
Future annual principal payments
Interest rate margin (as a percent)	2.75%
Interest rate (as a percent)	0.75%
Credit facility \| Amended and Restated Loan Agreement
Future annual principal payments
Maximum borrowing capacity	$ 35,000
Credit facility \| Letter of Credit
Future annual principal payments
Maximum borrowing capacity	$ 10,000
Line of credit
Credit Facilities
Line of credit			$ 14,000	$ 11,517